The 4 Pack Spring Steel 1095 is a high-quality steel flat measuring 1/8" x 1-1/2" x 12" designed specifically for knife making. Produced by Patriot Steel, this marking knife is ideal for creating precise and intricate cuts. Please note that this product may contain materials known to the State of California to cause cancer and reproductive harm. Always follow proper safety guidelines and precautions when working with knives and steel.