Visual efficiency: Helps make your rig more attractive to fish. Versatility: Set contains a variety of sizes to adapt to all situations. SW PH BDS KT Phosphorescent Bead Set features: Set of 100 phosphorescent beads in 3 sizes: Length: 4.5 mm Exterior diameter: 3 mm Interior diameter: 0.8 mm Quantity: 50 pieces Length: 7.5 mm Exterior diameter: 5 mm Interior diameter: 1 mm Quantity: 30 pieces Length: 9 mm Exterior diameter: 6 mm Interior diameter: 1.2 mm Quantity: 20 pieces Angler advice: How are the beads used?: We recommend you put your beads under a UV light. Reel in more fish during your night sessions!