Thanks For Your Interest In Rydesafe Reflective Decals. Each Kit Lets You Customize Your Bike And Accessories. It'S As Simple As Peel And Stick. We Cut Our Decals From An Engineering-Grade Reflective Film. Its Microscopic Glass Spheres Reflect Light Back To Its Source. This Makes Cyclists And Users Of All Kinds More Visible To A Person Behind The Wheel Of An Automobile. While, Rydesafe Reflective Decals Are Not Intended As A Substitute For Safety Lights, They Will Greatly Increase Your Visibility On The Road.