6/0 Grade A Round Glass Seed Beads, Metallic Colours, Prussian BlueSize: about 4mm in diameter, 3mm thick, hole: 1mm; about 4500pcs/bag.â Good Quality: seed beads are made of high-quality glass, durable and sturdy, They are imitation Japanese seed beads which uniform in size and shape. â Wide Usage: Metallic effect gives jewelry designs a metal bead appearance. Suitable for DIY retro bracelets, necklaces, earrings, jewelry accessories, gifts, clothing and other crafts.