These faceted round cat's eye beads come in a versatile 6mm size that works well for bracelets, necklaces and earrings. These fiber-optic glass beads get their name from their ability to capture and reflect light, creating a shimmering band at their centers that gleams like a cat's eye. This effect is also known as chatoyancy. They are sold on 16-inch strands (approximately 65-70 6mm beads per strand).