Cabochons Pandahall 20pcs 20mm Half Round Flat Back Clear Glass Dome for Photo Pendant Craft Jewelry Making Size: about 20mm in diameter, 6.4mm(Range: 5.9~6.9mm) thick. Material: Glass; Color: Clear; Usage: Cabochons Shape: Half Round; Priced per 20 pcs Best used with earring, cuff link, ring. Crystal clear glass cabochons magnify designs and patterns when placed on top of paper or fabric.