Why spend time counting beads by hand? Bead counters are time saving tools that are very simple to use. This set includes 4 different trays, one for each of four popular sizes 3,4,6, and 8mm. Each sturdy plastic tray has a sliding divider that blocks off extra spaces sos you collect only the beads you need. You can measure up to 100 beads with the 3 & 4mm trays, and up to 50 beads with the 6 & 8mm trays. They're small, lightweight and portable too!