Yasuji Steel No. 1 Blue Paper can be used and sharpened to the handle - Wood carving - Shape: 60 degree triangle; Blade width: 0.3 inches (7 mm); Total length: 1.8 inches (45 mm); Compatible models: HCT-30S, HCT-30Z, HMA-100A, HMA-100B, HCT-30C; Blade thickness: 0.0 inches (2.0 mm). Steel Blue Paper No. 1 Uses (FR2221, HSSC uses high speed steel)