The plastic light stick shows your rod tip and float at night. How to use: Bend the plastic glow stick to activate. Providing a transparent tube to join between two sticks, orange float for viewing. Easy to position it between fishing rod and floats at night time. Light-emitting time: glow steady around 15 hours at 25 .(influenced by environmental temperature or other factors, luminous time will be different) Suitable for fishing, camping, various parties, etc. Each box include 15 pieces straight head sticks or 10 pieces big head sticks. Specification: Material: Plastic 2.9 Straight Head Size(LxDia.): approx. 2.5x0.2cm / 1.0x0.08inch 3.5 Straight Head Size(LxDia.): approx. 2.8x0.2cm / 1.1x0.08inch 4.5 Straight Head Size(LxDia.): approx. 4x0.5cm / 1.6x0.2inch 4.5 Big Head Size(LxDia.): approx. 3.5x0.9cm / 1.4x0.4inch 2.9 Big Head Size(LxDia.): approx. 2.3x0.6cm / 0.9x0.2inch Package Includes: 1 Box Fishing Glow Sticks (15 Pieces Straight Head or 10 Pieces Big Head) (2 Pack) Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thank you.