20 sets of metal copper snap buttons + manual installation tools,Down button,DIY accessories. high-grade metal snap. - AliExpress
Celtic Craft - Ring Spring Snap-Fastener 14mm Brass copper-antique nickelfree
Amazon.com: RuiLing 20Sets 19mm Copper Sew on Snaps Buttons Press Button Fasteners Gun Color for Clothing, Hat, Bag, Jackets, Jeans, Shirts, Windbreakers
Snap Buttons: Prong Type, Snap Button, Part C'-Stud, 12mm, Copper
24L Anti-Copper Cap Snap Button Set – S&J USA, Inc.