Kiku Professionally Annealed Copper Bonsai Wire

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We temporarily stopped producing KIKU Copper Wire.  Due to recent price increases, the price per 1/2 kilo is nearly double our regular price.  We do plan to have this made again in the near future, hopefully copper prices return to pre-pandemic levels.

Kiku wire is striving to produce the best copper bonsai wire available in America.  99.9% pure solid copper wire is professionally wound to the appropriate size rolls (larger than most) to help eliminate the hardening of the wire as you uncoil it.  This is less important in the smaller sizes which is why the smaller sizes have tighter coils.  Each coil is wound to a precise weight resulting in consistent rolls.
The wire is then taken to a professional metal hardener that has been heating metal for 40+ years.  He also happens to be a bonsai guy so he knows good wire.  Here the wire is heated to the appropriate temperature to make the softest copper in the states.  The wire is then pulled and carefully cooled through a proprietary process that significantly reduces the scale or black coating you find on some annealed copper wire.  This black scale can "spray" off the wire as you use it causing eye injury.  We do our best to keep this to a minimum, especially on larger sizes where spraying is much more common.  This also makes for a cleaner bonsai experience with less black on your hands after wiring.  If you are wiring a pine, you obviously don't care about this as your hands will be destroyed by the end anyway.

Each roll is inspected, re-bundled and tagged with a Kiku label and small wrap of Velcro to keep your wire together after the zip-ties and label are removed.

Cheaper annealed copper wire is readily available, but none that combine the quality, softness, cleanliness and love that we put into this wire.  We intentionally made this wire to higher standard. If you are looking for the best copper on the market, look no further than Kiku Annealed Copper Bonsai Wire!


 Copper Feet Per KG (approximate)
Wire Guage Feet Per 1/2 KG  Diameter (mm)
#22 665 .64
#20 375 .81
#18 230 1.02
#16 144 1.29
#14 93 1.63
#12 58 2.05
#10 35 2.58
#8 22 3.26
#6 15 4.11
#4 8 5.19

Customer Reviews

Based on 63 reviews
Scott Russo (Buffalo, US)

Kiku Professionally Annealed Copper Bonsai Wire

Pauline Muth (Amsterdam, US)
Good copper

Nicely annealed. Workable

Bogdan Ksiazek (Cary, US)

Very good

Vern Van Houten (Seattle, US)

It is exactly what I was looking for. Thank you

Tom Cathers (Columbus, US)

Good quality wire, good order process


Ask a Question
  • What gauge wire should be used for anchoring?

    Trees to the pot?  That would depend on the size of the tree.  We don't use copper and for most average size trees we use 2.5 or 3mm.

  • I have a 3 year old 2 needle pinion pine bonsai that I started about 2 years ago. Trunk is about 1/2 to 5/8 diameter, extending on up to the very small diameters. What diameter wire do you suggest?

    It would likely need size 6 or 8 to bend and hold a 5/8" trunk, but this size would not be able to be used on anything but the trunk on this tree.

  • If using on a small Japanese maple outside. What guage should I get? Branches are at most 1/2 inch thick to much less.

    In general if you are wireing a deciduous tree, you use aluminum bonsai wire.  It is cheaper and will be less likely to strip the bark off of the tree.

    Size all depends on the branch that you are wireing.  If you plan to fully wire the tree, you will likely need many sizes.  Generally speaking, you use wire about 1/2 the diameter of the branch you want to bend for aluminum wire.  For copper wire you should use wire that is about 1/3 the diameter of the branch.


Thank you for your purchase. We hope you are happy with your items! However, if you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund, store credit, or an exchange. Please see below for more information on our return policy.


All returns* must be postmarked within thirty (30) days of the purchase date. With the exception of returns for broken/damaged items, all returned items must be in new and unused condition, with all original tags and labels attached.

*Plants + Trees Returns: By purchasing a tree from us, we assume you know how to properly care for the tree. Bonsai and other plants are alive and will die if not properly cared for. We have no control over how trees are cared for once in your possession. Therefore, by purchasing this tree, you acknowledge that we, the seller, provide no warranties expressed or implied after the tree is delivered. This tree is sold "AS IS" and this sale is considered final. No refunds or exchanges will be offered after the tree is purchased. We will only ship healthy trees. We will require a signature on most trees over $100USD. If the box arrives damaged, please take pictures and make note with the shipping company prior to signing. If you sign for the package, the sale is final.


For the easiest way to process returns purchased through our website, please visit:

For items purchased through Etsy, please include the item and invoice # and return to:
Superfly Bonsai
1670 S. Cameron Street
Harrisburg, PA 17104

For items purchased through Amazon, Walmart, or eBay, please visit the vendors website. Linked below is information from each vendor to get you started.
Amazon: click here
Walmart: click here
eBay: click here

Please note, you will be responsible for all return shipping charges.* We strongly recommend that you use a trackable method to mail your return.

*Certain returns may be eligible for shipping charge reimbursement. We reserve the right to refuse refunds on shipping charges based on reasons for return.


Once we receive your item, we will inspect the condition of the items and notify you that we have received your return. We will also notify you on the status of your refund after we've inspected the item.

If your return is approved, we will initiate a refund to your original method of payment. You will receive the credit within a few business days, depending on your card issuer's policies.


If you have any questions concerning our return policy, please contact us at:

*Management reserves the right to refuse a refund, exchange or the resale of any item based on the condition of the merchandise.

Shipping Policy

Order Processing

All orders are processed within 2 to 3 business days (excluding weekends and holidays) after receiving your order confirmation email. You will receive another notification when your order has shipped.

Plants + Trees Shipping: Shipping may be delayed to prevent the tree from sitting in a warehouse over a weekend or holiday. Most trees ship Monday-Wednesday. We do not ship trees to PO, FPO, or APO boxes. We also do not ship trees out of the continental US or to California.

Domestic Shipping Rates and Estimates

For calculated shipping rates: All orders (under $99 USD or Wholesale) will be presented with shipping options that are calculated based on the item weight, box size, and distance from our shipping location.  We currently only use Fedex.
Free Shipping: All RETAIL orders over $99.00 USD ship free within the continental USA. Free shipping will be the lowest cost option from FedEx.

In-Store Pickup

You can skip the shipping fees with free local pickup at our warehouse. We are located at:
1670 S. Cameron Street
Harrisburg, PA 17104

We will send you an email when your order is ready along with instructions.
Our in-store pickup hours are 10AM-4PM Monday-Friday. Please have your order confirmation email with you when you come.

International Shipping

At this time*, we do not offer international shipping.
*Shipping to Canada and Mexico will be available at some point in the near future. Check back for updates to this section.

How do I Check the Status of my Order?

When your order has shipped, you will receive an email notification from us which will include a tracking number you can use to check its status. Please allow 48 hours for the tracking information to become available.
If you haven’t received your order within a reasonable amount of time, please contact us at with your name and order number, and we will look into it for you.

Shipping to P.O. Boxes

FedEx: FedEx will only ship to P.O. Boxes with SmartPost, which we do not offer at this time. Click here for more information.

Refunds, Returns, and Exchanges

We accept returns that are postmarked within thirty (30) days of the purchase date. With the exception of returns for broken/damaged items, all returned items must be in new and unused condition, with all original tags and labels attached.
In the event that your order arrives damaged in any way, please email us as soon as possible at with your order number and a photo of the item’s condition. We address these on a case-by-case basis but will try our best to work towards a satisfactory solution.
If you have any further questions, please don't hesitate to contact us at

Large Orders

If you are a placing a larger order (over 30 bags of soil or many pots), it may be cheaper to ship via freight truck. If you are interested in pricing for this, please contact us here.

Show Pickup & The Superfly Express

We attend 7-10 shows a year (if not cancelled), mostly on the east coast. Please check our calendar to see if we may be attending a show close to your location, and we can arrange to bring your order for pickup at the show.  No minimum.

We started the Superfly Express shortly after the Covid-19 pandemic started.  We did this as a way to get products to wholesale customers with no shipping fee.  We basically will deliver your order on one of our trips to your area for free if the order is over $1000 and you are close to our route.  We will also deliver retail customers orders over $1000 if they don't want to utilizer our free shipping for whatever reason.  We currently only travel east of the Mississippi river and have 4 routes.
1.  New York/New England Area
2.  Ohio/Michigan/Illinois/Indiana Area
3.  Western virginia & NC/Tennessee/Alabama/Mississippi/Kentucky
4.  Maryland/Eastern Virginia & NC/SC/Georgia/Florida

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