The base metal is old iron, and steel is used for the blue paper. By creating countless patterns and textures on the surface of the chisel. A unique woodgrain finish is achieved that cannot be replicated elsewhere. The patterns are created by hand-hammering. So no two pieces are exactly alike. Wood grain craftsmanship involves repeatedly hammering the base metal (old iron) to create patterns. This process requires significant time and effort. Resulting in a unique and beautiful pattern. This is a genuine masterpiece of value. Pursuing sharpness, usability, and decorative beauty. This chisel is crafted by the renowned artisan, Tasai. Blade length (excluding handle): approx. Blade width: 7.5 mm. Feel free to message us if you have any specific questions – we’re happy to help! Looking for more Japanese tools? 100% authentic from Japan? Receipt available on request?? Personal info is protected?? No undervalue / gift requests?? Mon-Fri / 9:00-17:00 (JST)?? Replies within 24 hrs?? Help Us Grow – Your Feedback Matters! ? We’re a small, family-run store in Japan, supported by an amazing local team. ? Each item is carefully selected and packed with heart – we hope it brings you joy! We’re always growing – and would love for you to follow our journey! ? Don’t forget to leave feedback & check back for exciting new items!