Size 15 seed beads are the smallest size seed beads in common use. Miyuki seed beads are made of glass, and Japanese seed beads are manufactured to be consistent in size and color. 15/0 seed beads are perfect for adding detail, bridging between sizes, or keeping things delicate and intricate. 15/0 seed beads measure 1.5mm x 1.3mm with a hole size of .7mm. Count is approximately 250 beads per gram.