The rivets and pads are made of copper, featuring high hardness, rust resistance, wear resistance, and corrosion resistance. The fixed device is made of stainless steel, and the punch is made of steel. Copper rivets in 5 sizes: 9 x 3 x 11mm, 9 x 3 x 13mm, 9 x 3 x 16mm, 9 x 3 x 21mm, and 12 x 4 x 21mm. Includes 50 durable solid copper rivets with pads, 2 different sizes of punching tools, and 1 cushion fixed device. This kit includes copper rivets, pads, punch tools, and a cushion clamp, providing all necessary components for leather crafting projects. Ideal for repairing or decorating handbags and other leather goods. Rivets can be used for both functional and decorative purposes in DIY leather crafts, suitable for belts, handbags, wallets, clothing, key pouches, crossbody bags, pet collars, leather bracelets, and various leather accessories. Material: Copper Color: As shown Package Contents: 1 set leather working kit Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3cm.