1.Suitable for mold factory,beat stainless steel, steel, automobiles, motorcycles, bicycles and other metal, leather, wood and other tanning printing<br> 2.These stamps are for stamping soft metals such as Soft steel,aluminum, pewter, alkeme, copper, and brass.<br> 3.These stamp sets are lightly coated with oil. Simply wipe down with a dry paper towel or rag before using. (Avoid wiping with anything wet - water will cause stamps to rust.) <br>