Flashmer Iridescent Beads (bulk) are made of hard plastic with a pearlescent finish. They measure 5 mm in diameter, with a 0.9 mm hole. They are used on surfcasting lines, bottom-fishing lines, and on Texas rigs or drop shot rigs. The bag contains 1,000 beads of the same size. The iridescent finish produces a shimmering effect and is not phosphorescent.