They're fast and simple: just clip one to the end of your working strand or partially-used strand, to prevent accidental spills.
Neatly keep your beads on the strand where you want them. Clip one to each end of your working strand so you can pick up the strand to check the length or hold it up to a mirror, without spilling beads off either end.
Safely store half-strands of gemstone beads by clipping a bead stopper to the open end.
Protect your work when you transport an unfinished piece.
Mini Bead Stoppers are recommended for seed beads and other delicate work, and the classic size of Bead Stopper is recommended for gemstone bead strands or other medium/large bead strands.