Water drill crystal, Stunning cutting lines!! Dazzling!! Wanna try AB coating colors? ABB or AB is short for Aurora Borealis, the iridescent reflective coating that shines with all the colours of the rainbow. Model No.: DF20 1. Material is crystal glass, the quality is comparable with Swarovski beads. 2. Sizes: 10mm,14mm,16mm,18mm,20mm are available 3. More than 30 colors 4. Used for jewelry findings, garment ornament, home decoration.