Bliss Illuminating Valve Caps are automatically actuating valve caps that highlight your wheels in low light situations. Bliss Illuminating Valve Caps activate only when your car is in a low light situation and when the wheel is moving. Bliss Illuminating Valve Caps are assembled using a CNC machined, polished, billet body (not found in other brands). Bliss Illuminating Valve Caps utilize copper internal parts to enhance conductivity to create the brightest possible light (not found in other brands). Bliss Illuminating Valve Caps use an inner backing spring to keep the batteries in place so that the valve caps will illuminate at speeds higher than 60 miles per hour (not found in other brands). Bliss Valve Caps utilize a true LED "bulb" not a cheaper plastic white chip (as found in most brands). Bliss Illuminating Valve Caps come packaged with 3 batteries, since research has found that with the extra battery the light will be significantly brighter (other brands have only 2 batteries). By putting so much research and design into such a small item, this ensures that you will be getting the highest quality product on the market. Be sure to ask for them by name. Burn up the night with Bliss Illuminating Valve Caps! Available in five colors: Blue, Hyper White, Red, Yellow, and Green. Bliss Illuminating Valve Caps are universal fit on cars as well as motorcycles!!!