Characteristics : Structure: 1 button face + 1 nail (2 pieces for a set). Material: high purity copper. Color: gold, silver, bronze, bronze. Small Size: Cap: 6mm, Shank: 6mm, Bottom: 6mm. Medium Size: Cap: 8mm, Shank: 8mm, Base: 8mm. Large Size: Cap: 8mm, Shank: 12mm, Base: 8mm. 1.Material: Leather rivets are made of sturdy and durable copper and are good for repairing broken belts and decorating your leather craft. 2.Size: The package contains 300 sets of double cap rivets in 3 colors (gold, silver and bronze) and 3 fastening tools. 3.Easy to use: just run it er warm water to wash out the brush and hang it to dry. Before using them again, soak the pen in clean water. 4.Wide Use: Perfect for leather crafts, tents, clothing, leather, furniture, wallets, bags, home improvement, repairs and decorations.