These button blanks are made of white plastic. Illustrated instructions on the rear of the package show how easy it is in four steps. In addition, a cutting template for cutting a circle in the fabric is illustrated. Depending on the textile used, the finished buttons can be washed at up to 60 degrees. They come in 4 sizes: 22mm - 3 Buttons 19mm - 4 Buttons 15mm - 5 Buttons 11mm - 6 Buttons