Copper Sanmai (Cumai) or Cumascus
Copper San Mai: A Stunning Fusion of Strength and Beauty
At Damasforge, we’re proud to offer Copper San Mai blank blades and bars — a bold blend of traditional forging and artistic design. These pieces combine high carbon steel at the core with elegant copper outer layers, creating a one-of-a-kind look that knife makers and collectors love.
What Is Copper San Mai?
San Mai means “three layers” in Japanese. In Copper San Mai, the center layer is tough high carbon steel — giving the blade its cutting strength — while the outer layers are made of pure copper, adding a beautiful, warm glow to the surface.
This technique not only strengthens the blade but also gives it an eye-catching, luxurious appearance. The copper develops a natural patina over time, giving each blade even more character.
Why People Love Copper Layers
Unique Appearance – The bright copper against dark steel creates bold, elegant contrast.
Custom Patina – Copper changes color over time, making each knife truly unique.
Artisan Quality – Every bar or blade is handmade with care, showing craftsmanship in every detail.
High Functionality – With a strong carbon steel core, these blades perform just as well as they look.
Made to Order – Custom Sizes Available
Whether you’re a knife maker looking for blank blades or a blacksmith in need of custom Copper San Mai bars, we’ve got you covered. We take custom orders and can forge bars to your preferred sizes and patterns.
Every piece is made in-house with precision and passion.
Shipping Worldwide
Before delivery, our blades are finely polished and inspected to ensure they meet the highest standards. Each piece is carefully packaged, ready to inspire its new owner with unmatched quality and artistry.
We proudly ship worldwide, bringing our Copper San Mai products to craftsmen and enthusiasts around the globe. No matter where you are, you can enjoy the beauty and strength of our unique materials.
Want to place an order or see samples? Click here
Have questions about working with Copper San Mai? Contact us anytime — we’re always happy to help.
