One thousand pyu bead, pyu bead is also called Biao bead, is the ancient Burma, Biao countries to stay the beads with distinctive features.Biao bead belongs to set a branch of corrosion class GuZhu, so the bead gro belong to the day.Biao main material is agate beads, but there have also been petrified wood, the material such as ore, petrified wood material Biao bead also calls the petrified wood Biao bead, this kind of material Biao bead and, like a bond.Size: about 16.2 mm