Pandahall 20SETS Brass Platinum Snap Buttons with Clear Glass Cabochons For Snap Button Making -18x4mm Size: snap buttons: about 18mm in diameter, 4mm thick; knob: 6mm; tray: 16mm; glass cabochons: 16mm in diameter, 5.3mm thick. Material:Brass + Glass; Color:Clear; Shape:Flat Round Perfect to DIY: Ideal to be added to any snap button ring,snap button bracelet or snap button necklace. Enjoy your DIY now ! Paste pattern or put some tiny beads in the tray then cover with the clear glass cabochon. You also can add these buttons to your clothes, bags, belt, or wallet and so on. They will make your life more colorful and charming !