ImpressArt Signature metal stamps are professional quality stamps, manufactured to the highest standard for durability and alignment. Stamps are engineered from hardened steel and rated to endure stamping on soft and hard metals up to Stainless Steel*. Sharp design edges ensure crisp, deep impressions project after project. Designs are marked on side of stamp for easy identification and orientation. Size: 2mm *Rated for stamping on Alkemé, aluminum, pewter, copper, brass, silver, gold, & other metals up to 56HRC Rockwell Hardness.