They're from Peru. They're ceramic. They're handpainted. Drilled side to side. Approximately 1 inch high, .5 inches wide, .5 inches thick. PCB = Peruvian Ceramic Beads. Most of the PCB holes will take a 2mm cord, some just close to a 2mm cord. Sold in units of 5 so to buy 10 choose 2 units, to buy 100 choose 20 units