Authentic and Original Full Set of 3 (63 Punches): metal stamping kit includes (1) uppercase letter set (1) lowercase letter set (1) number stamp set. Creative and unique metal stamp, perfect for making jewelry, DIY projects, and customized presents or keepsakes. Size: The stamp heads are 3mm. The letters will naturally vary in size. The shank size is 2 1/4'' x 1/4''. Please note that sides of stamp are NOT labeled with markings. For stamping soft metals including aluminum, pewter, Alkeme, copper, brass, nickel silver, and also wood. Do not use on stainless steel. Make sure you are working with a flat brass head hammer and steel bench block on an even and stable table. Color of storage cases will vary. Each set includes either an orange or teal storage case to hold your metal stamps in place.Stamps are oil-coated to protect from rust - simply wipe down with a dry paper towel or rag before using. ImpressArt's Bridgette letter stamps have that hand-written, finger-brushed look, but are also crisp and easy to read. This graceful, wispy typeface is perfect for upbeat messages and softer-looking stamped jewelry and craft designs. ImpressArt's Bridgette letter stamps have that hand-written, finger-brushed look, but are also crisp and easy to read. This graceful, wispy typeface is perfect for upbeat messages and softer-looking stamped jewelry and craft designs. In order to prevent rust, 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.)