This is a glass bead work by Green Glass, a Japanese glass artist. It uses borosilicate glass (Pyrex), a heat-resistant and durable glass, which is said to be very resistant to breakage. The colors and appearance change considerably depending on the color of the clothes you wear, the color of the light that hits it, and the viewing angle. Each piece is handmade and one-of-a-kind. It fits Trollbeads bracelets. It is also recommended to thread it on leather cords or use hemp to create accents. This is a listing for the bead only. Hole size: 4mm Lampwork beads, Trollbeads, glass art, Pandora, Be Charmed, Dragon Pipe