Features:Made of high-quality reflective material.Able to clearly reflect the light of car headlights， street lighting， etc.No need of tool， easy to install on the spoke of bike wheel.Effectively guarantee the visibility under poor light source.Note:1. The product can not give out light itself. The effect can not be seen without light.Specifications:Material: ABS & reflective coating filmColor: SilverQuantity: 12pcsLength: 8mm / 0.3inDiameter: inner 1.9-2.4mm， outer 5mmPackage size: 7 * 12 * 0.6cm / 2.8 * 4.7 * 0.2inPackage weight: 16g / 0.6ozPackage including:12 * Reflective Spoke for Bicycle Wheel