Clear plastic buttons used to secure regular buttons on couture garments. They give more stability to buttons sewn onto knitted garments and help to keep heavy buttons from distorting the fabric of your hand-made pieces. You can find a tutorial video on how to use backing buttons here: https://youtu.be/AxL-HXBdOgI

Each set provides 50 backing buttons (to get you through at least a few projects, no matter how many buttons you have on each), and comes in a folded origami pouch that can be tucked into your knitting or sewing bag and can be reused or recycled when your buttons run out.