This vintage nailhead bead is 5.5 mm round. These are a flat faceted transparent disc shape. These are from the early 1900's and were produced in Bohemia. Glass nailhead beads were used in the days of the flapper to embellish garments before sequins were developed. The image does not do these beads justice. You will receive 24 beads per lot. These beads really remind me of cherry red lollipops.