The Crystal Lane metallic round flatback rhinestones are made of high-quality crystal glass with machine cutting technology for a perfectly faceted appearance. Add a little glam and a shimmery flourish to your DIY crafts, art projects and fashion design projects with these gem rhinestones. Details: Available in multiple colors SS 20 (4.7 mm) 144 rhinestones Round flatback Glass Fix to surface with glue (sold separately)