1100 Sets: You will receive 100 sets of button making supplies, including metal covers, plastic bottoms, and transparent protective films. 2Metal Back Pin: The back is designed with a metal pin, which can be pinned on clothes or bags and can be used repeatedly. 3Applications: Button pin badge kit is very suitable for school events, name tags, souvenirs, personalized birthday gifts, holiday gifts. It can be used for clothes, backpacks, hats, etc. 4DIY: These round badge button parts are suitable for button maker machine, you can do DIY with your creativity and imagination. 5Antirust: Tinplate and plastic base can effectively prevent rusting and make your work more long term use and preservation.