These petite 2.5mm crystal beads have a .6mm hole with a rounded edge to reduce wear on your stringing material. These crystal glass beads are perfect for dash of color in a necklace design or bracelet project Swarovski's brand of Austrian crystal is famed for its precision shape and brilliant color. How much more black could the Jet Bicone Bead be? The answer is none, none more black. Perfect for adding a sense of mystery and intrique these jet black beads create a pure reflection that never looks back. Adding these Swarovski Bicone Beads to your next jewelry project creates an unmistakable sign of authenticity and elegance.