Material: Plastic. Size:12mm,14mm.17mm Nickle free. This jeans button consists of two parts: jeans button and nail. It is widely used for jeans, trousers and suitcases. Cap size ranges from 12.5 to 25mm and it can be matched with our rivets. Eco-Friendly , Dry Cleaning , Magnetic , Nickel-Free , Washable. buttons plastic button, metal button