Seed bead sizes work a little differently than most other bead sizes and can often be confusing. Instead of simply being labeled with a millimeter measurement, seed beads 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 is that 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. The chart below outlines size in millimeters of each seed bead size, as well as the hole diameter. Please note the the measurements and counts are approximate and may vary slightly between manufacturers.