These stamps are made out of hardened 40 CRV Steel to a 60-64 HRC Hardness. This set includes 27 pcs, A Thru Z plus the & symbol. These come with some oil on them to prevent rust. They are brand new and never used. These stamps are made out of hardened Steel. These are great for stamping Jewelry or your tools or silver or Gold bars you are making from either bullion or scrap. Letters are 6MM tall or apx 1/4" tall. Stamps are 2 5/8" Long.