The most commonly used seed bead size is 11/0, or 2.1mm. You would need about 21 beads to string an inch of 11/0 bead size.

Seed beads sizes range from 3/0 to 28/0, and the smaller the number, the larger the bead. The size 6/0, about 4mm, are also known as E beads. We offer high-quality Seed Beads in several sizes with many different finishes and styles.