Details: The package includes 15 pieces of blank challenge coins with acrylic protective box, diameter 4cm/1.57 inches, thickness 0.2cm/0.08 inches, enough quantity and suitable size for you to DIY or make crafts. This challenge coin set features a compact blank surface, perfect for laser engraving various patterns, text, logos or designs; each coin comes with an independent parent acrylic protective box to better protect the coins , to prevent loss, scratches, damage or soiling. This set of blank coins is made of solid Metal with non-electroplating brushed treatment, durable, dustproof, rustproof, wear-resistant, not easy to fade, break or deform, and can be used for a long time. Blank coins can be engraved as collectible coins or commemorative coins, suitable for coin collection, DIY craft enthusiasts, family, friends or colleagues, and can also be matched with various hooks, rings, pins, tassels, etc. to make exquisite pendants , necklaces, bracelets, earrings, customized key chains, pet ID collars, souvenirs or other decorations. Metal coins are suitable for laser engraving, hand engraving or metal engraving machines. The internal materials may be oxidized, blackened or patinated during the engraving process. This is normal! Pack of 15 Blank Challenge Coins DIY Hand Engraved These blank challenge coins are made of high-quality solid Metal with a non-electroplated brushed finish, making them durable and rust-proof, not prone to fading, cracking or deformation, and easy to engrave. Each blank challenge coin will be paired with a plastic box, designed to provide better collection and protect it from loss or scratches. This set of blank coins is perfect for laser engraving and can be engraved into various patterns or text and given to friends, family, and friends as meaningful gifts. You can also usethese blank coins to create beautiful earrings, necklaces, bracelets, key chains, ba