Sufficient sets for making buttons: 300 pieces (100 sets) of blank button making supplies, each set includes 1 metal shell, 1 metal back cover and 1 transparent film, allowing you to make 100 pieces of buttons or badges with your own style. Size details: These round badge button parts are designed for 25mm/1 inch button badges. The metal shell is 25mm/1 inch in diameter, metal back cover is 23mm/0.9 inch, and transparent film is about 35mm/1.38 inches. Compatible with button making machines for 25mm/1 inch components. Personalize your own buttons: Blank surface for DIY. Choose your favorite picture, photo or sticker, cut to size, then press with metal cover, picture and plastic film on the badge machine mould, add back cover and press tightly to finish. Nice material: Metal shell and back cover are made of tinplate, sturdy, rustproof and not easy to deform. Transparent film is PVC, protecting the surface and keeping it smooth. Well-matched accessories for long-term use. Prepare gifts: Finished button pin badges with interesting patterns make creative gifts for friends, family and lovers on birthdays, holidays, travel or graduation ceremonies. Color as shown.