Package and Transportation Content: you will receive 10 pieces of threaded edged blank coins for engraving, Individually packaged acrylic box protect brass challenge coin from oxidation and damage.All coins are packaged in an plastic box, which is easy for transportation. Coin size and material: These metal billets used for carving have a diameter of approximately 40 millimeters/1.57 inches and a thickness of approximately 2.2 millimeters/0.0867 inches. Pure brass coin, without coating. / Silver Billet Coin Plating on Zinc Aluminum Alloy Surface Heart Warming Gift:these blank coins can be engraved into a variety of patterns to friends, family, girlfriend, boyfriend, colleague, coworker, neighbor, classmate, father, groom, friend as meaningful gifts. DIY Fun: the surface of these metal tags is blank, which is perfect for DIY enthusiasts; you can make some personalized designs on blank coins, such as various patterns and words; laser-engraving blanks can also be matched with various hooks, rings, to make beautiful badge, charms, pendant, dangles, necklaces, custom key chain like pet ID tags, keepsakes. Aluminum silver-plated coins are suitable for manual engraving, metal engraving machine engraving, starting power of 10W-20W can leave traces on the metal coins. Colour:Gold/Silver Material:brass/Zinc alloy Size:40mm Package Contents: 10 * Blank Challenge Coin Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.