The size is 5mm. These are stunning old beads. Faceted on one side and flat on the back. Nailhead beads were the first form of sequins. They work well for embellishing as well as for adding some real unique old fashioned style to jewelry designs. Sold in strands of 50 beads per strand. Beautiful nailhead beads. These are being sold by the strand. That's approximately 24 beads. But you know how vintage things are don't you. After counting several strands of beads we see that some have more and some have a bit less but all should have at least 24 beads or more.