Overview: Material: Pyrite Shape: Skull Number of Beads/Strand: 8mm in diameter - about 25pcs/strand 10mm in diameter - about 20pcs/strand 12mm in diameter - about 17pcs/strand 14mm in diameter - about15pcs/strand 16mm in diameter - about 15pcs/strand 18mm in diameter - about 11pcs/strand Usage : For bracelet,necklace, or other crafts, jewelry makings ***Please conv. me if you need quantity discount.Note: For Gemstone beads, the hole size is approximate. For smaller size beads e.g., 2mm, 3mm, hole size is less than 1mm.