These cute little nailhead beads measure 5.5mm. These are very rare in color and the hollow back is also an early and rare characteristic. The top side is faceted and domed. The blue color is a wonderfully transparent shade of cobalt blue. They are from the early 1900's. Glass nailhead beads were used in the days of the flapper to embellish garments before sequins were developed. You will receive 24 beads per lot.