Otaka Beads are approx 10 -12mm in diameter x 3- 4mm in thickness approximately. Due to the handmade nature of the beads, these sizes can vary slightly. The green Okata Bead in the photo is for reference only as is the penny for sizing. 10 Beads per strand. Free Spacer beads included (and will vary, not necessarily the spacers seen in the photos).