Elemental Knucklebone Dexterity Toys - Exotic Metals


Raised $38,484 on Kickstarter

Highly polished exotic metal dexterity trainers


We raised over $35,000 on Kickstarter with our Knucklebone Dexterity Toys made of solid Titanium, pure Copper (Sold Out!), black Zirconium, and dense Copper Tungsten.

The Polar Dexterity Toy is manipulated with the fingers with one or both hands to train dexterity, perform tricks, or as an advanced stress relief/fidget device.


  • The ultimate dexterity trainers 
  • The perfect way to display exotic metals at your desk
  • Social magnet
  • Great educational items 
  • Built for a lifetime of stress relief and brainstorming

Buy once and keep forever! 


Sold out!

Denser than lead, our Copper-Tungsten toy weighs more than 35 of our 3d printed prototypes!

142 grams. The ultimate super-dense Copper Tungsten(VFG30)! 

Since it's so dense, it's a great way to build up your hand muscles for those of you more advanced.

Our Copper-Tungsten (WCu) toy is by far the densest available. Denser than silver, lead, and even mercury! We combined 30% copper with 70% tungsten for a strong and durable metal matrix that can withstand all the impacts and drops you can throw at it.

Sample density: 14.22g/cc (CW70)

Tungsten copper is very difficult to polish, but after several attempts, we made this amazing mirror finish!


Sold out!

Pure copper is Oligodynamic, which means it naturally kills germs on contact. 

  • We each have about 2mg of copper in our body, without which we could not survive.
  • Along with gold, the only non-greyish pure metal 
  • Takes on its own unique hue over time and can be “reset” to brilliancy with baking soda and water (or salt and vinegar)
  • Sample density: 8.96g/cc

This is really my new favorite! Since it's oligodynamic, it will kill germs each time you use it! It's also denser than nearly any other toy out there (besides our own WCu) so it's for more advanced users or those that want to build up your hand muscles. 

Highly polished by hand! It's very satisfying to let it dance between your fingers. 

Pure Copper has the strongest known oligodynamic effect of any pure metals. It prevents growth and even kills bacteria, molds, spores, fungi, viruses and other organisms. Copper compounds have been used in medicine to treat many ailments, including arthritis. 


  • An exotic, rare super-metal
  • Used in jewelry and other decoration for centuries 
  • Resistance to corrosion: even higher than Titanium 
  • Named from the Persian "zargun" or gold color 
  • Common in cool stars and moon rocks 
  • Sample density: 6.52g/cc

Zirconium creates a natural, beautiful, jet-black oxide layer when heated at high temperatures. This layer makes it incredibly durable and scratch-resistant. It’s black lustrous finish is very beautiful making this the ultimate dexterity toy.


  • Used extensively in the aerospace industry 
  • The most biocompatible and safe metal for the human body
  • Named after Titans of Greek mythology 
  • The highest strength-to-density ratio of any element 
  • Resistance to corrosion: won’t tarnish 
  • Sample density: 4.506g/cc

It helps you train your finger dexterity passively, reduces anxiety, and keeps your mind focused. Polished finish and rainbow finish are available now!


Polar Elemental Dexterity Toys are manufactured one at a time (CNC) for precision and hand polished to get a quality finish.

Each toy comes with a quality transport bag. You can take it and show off or train your skills anytime and anywhere.


  • Size: 20 * 60mm
  • Weight: 142g (Copper Tungsten), 45g (Titanium), 65g (Zirconium)


At Polar, we seek to spice up your life with interesting and unusual metals in unexpected ways. We've specialized in TitaniumCopper and Zirconium so far! We are now working on bringing lesser-known metals into the light like Tungsten and Copper Tungsten and other exotic metals. We are true metal lovers.

With your support, we've raised over $100,000 by crowdfunding unusual and interesting metal products. I love metals and I love the crowdfunding community. We have a perfect fulfillment record with your great support, and we intend to keep it that way!

Polar Metals raised over $16,000 crowdfunding these knucklebones on kickstarter. Get yours now!

Customer Reviews

Based on 7 reviews
Eric Jaquez
Great piece!

This knucklebone is very well made, perfectly balanced, and has a good heft to it. I am used to lighter knucklebones but find this one conducive for some tricks that are harder to perform with lighter pieces.

I also like the rainbow finish very much, and I would recommend this piece to anyone interested in Knucklebones.

Kranite, any chance of a smaller piece in the same rainbow finish? That would be great!

Hirobumi Gunji
I am happy to be with your rare metals here!!

Thank you again for your work and kindness. I am going to visit your site and will purchase another metal goods!! I love metal very much in particular your extraordinary ones. I am happy to be with your rare metals here!! I hope you will provide fantastic metal world further.

Markus Sch�fer
I like most titanium and zirconium.

I like most titanium and zirconium. They have both a nice weight, when you're not so trained. From the look it is copper and rainbow. The colours are amazing. But I have to admit, that the black one looks classy. They look great and have a nice Feeling. Especially the rainbow titanium has a fantastic colour.

Markus Schafer
I'm so excited to get my set.

I'm so excited to get my set :-) Haven't got tracking info by now, but I hope it won't take long.

Mike Beaudoin
Great job!

Received it, tried it, love it! Great job!

Thanks for everything!

Copper received. Thanks for everything!

Brandon Cromer
I'm super excited!

Hey there! I just got my knuckle bones in today (haven't had a chance to play with them yet), and I'm super excited!

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