Material: The triangle D-ring is made of heavy-duty zinc alloy that makes them strong and hard-wearing for handbag purse hardware, non rust. Size: the size options indicates the inside width of the ring. Please see dimensions in product images. There are 4 colors, Silver,Light gold, Gun black and Matte black for you chose. Zinc alloy triangle rings adjusters for purse making, landyard, keychain, ribbon, backpacks, handbag, luggage, belts, diy craft projects, etc.