Glass beads for grinding,blasting,polishing and reflecting mark Specifications 1 Character: Colourless and transparent ball, no visible bubbles ... Indes of refraction: 1.5Min Roundess: 80%Min for reflecting mark,90% Min for other application Grit Size:10,12,14 ... size, from 25mm or as the customers request. 3: Reflecting mark. 4. Fillers for the plastic / ceramic / refractories.