Flashmer Soft Glow-in-the-Dark Beads combine a flexible body with a glow-in-the-dark effect. This material maintains flexible contact with the surrounding components of the rig. The outer diameter is 5 mm, with an inner diameter of 1.6 mm. The glow-in-the-dark effect is activated by exposure to light before the rig is lowered. The packet contains twenty beads.