Seed bead sizes are not typically shown in millimeters like most other beads. Instead, they are labeled with a number that corresponds to their size. This number is often written like 11/0 and referred to as "size 11". The most important thing to remember (and the most confusing), is that with seed beads, the bigger the number the smaller the bead. For example, size 11, or 11/0, seed beads are one of the smallest sizes, and size 2, or 2/0, are one of the largest sizes. We hope the images below will help you visualize how the different seed bead sizes relate to each other. Check out our Seed Bead Sizing Chart for more information.