The Vevor pin back button parts set includes 200 complete sets for making 3" 75 mm round badges. It is designed for use with most 75 mm button maker machines and includes both metal and plastic bottom parts for different badge styles. High-transparency films help create a bright, polished finished look, while the metal covers add durability. These supplies are suitable for DIY badge making, gifts, events, and personalized craft projects. Please note that the button maker machine is not included.