5 sizes of beads with special treatments to create visual effects. iridescent (irr.), transparent (tr.), opalescent (op.) or silver lined (s/l), in 13 colors (some colors not available in every size). Bead diameter measures approx. 1.3mm for midge, 2.0mm for small, 2.8mm for medium, 3.5mm for large. About 20 to 100 beads per package, depending on the size you choose.