Fiber Optic Beads (Cat's Eye Beads). Our selection of Fiber Optic Beads is shown below. We have Cat's Eye Beads in 3mm, 4mm, 6mm and 8mm sizes. We also have Hearts and Stars with Rhinestones, 2x4 Fiber Optic Rondels and Fiber Optic Rounds with Rhinestones in 8mm, 10mm, 12mm and 14mm sizes. Click on one of the links below to begin shopping.