The ultimate in durability! This sheet stock material is TRUE stainless steel. The marking is black when engraved by our laser. Permanent! The revolutionary process uses precise lasers and marking materials scientifically formulated to permanently fuse to stainless for high-contrast, high-resolution marking. Can be used in any indoor or outdoor environment. Extremely vandal resistant -- the stainless steel will scratch before the engraved mark. Maximum size is 12” x 24”, thickness is approximately .025”. Many more sizes available. Additional charge may apply for intricate design requirements.