GCR15 bearing steel base material, with a hardness of up to HRC60, is tough, tough, and wear-. hardening treatment enhances hardness and significantly improves durability. Rubber-coated, non-slip handle with grained treatment for a comfortable, non-slip feel. 10 shapes,meet your different needs. Great for 3D Print Clean-up & Arts and Crafts. Compact and Portable: These small files are easy to store and carry, making them a handy addition to any tool kit. Color:Black & Silver & Yellow Material:Bearing Steel + Plastic Package Contents: 10 * File Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.