These are high quality glass beads. The red and blue beads are transparent on one side and the other side has been hastily painted to give a unique design to each bead which looks great coming through the transparent side. The white beads are frosted on one side and have an AB finish on the other side. AB stands for aurora borealis and gives a color changing appearance. All of the beads measure 8mm top to bottom and 4mm thick. The hole has an inner diameter of 0.8mm.