ImpressArt-Lowercase Stamp Set 3mm: Bridgette. Leave a lasting impression on your artwork! These metal stamps are designed with the jewelry maker in mind. They are precision-cut from hardened steel and will last project after project. Simply use a hammer to impress the design into a metal blank (sold separately). Each stamp has a 2-1/2 inch long shaft that is clearly labeled on one edge. The actual stamped impressions are 3mm. This package contains thirty-three 3mm metal stamps in one 3×6-1/2×2-1/2 inch storage case.