Clip on glow stick fitting medium sized rod tips (2-2.6 mm). Great for night fishing. Long life (approximately 8 hours). Fits snugly on rod, doesn't interfere with the line. The stick in the pictures is attached to a medium weight Ugly Stick. 10 packs included, each pack contains 2 glow sticks. Simply open package, bend the stick until you hear the clemical tube inside break and shake vigorously to mix the chemicals. Then attach to your fishing pole and your set!