leather craft jewelry is made of Metal. The material is shiny, , not easy to rust and can be used for a long time. You get 24pcs skull rivets and mounting screws. There are 3 colors in total, 8pcs for each color. 24pcs matching can let you use the punk elements more fully. The quantity is sufficient to create a full body punk style look. 3D skull shape is full of punk and retro style, using skull rivet decoration make you look cool and personalized. Leather Large Skull Decorative Rivet 25.5mm Width, 35mm Length, 14mm Thick, Hole Diameter: 2.4mm All you need is a small screwdriver to attach our leather decorative rivets to your items. These cool skull studs can be used to decorate not only necklaces, DIY bags, shoes, jackets, but also many of your favorite items. With sufficient quantity, you can make some exquisite and gifts for your friends or for punk rock style lovers.