Adds Glowing Flair to Tires Bright, colored LED sticks create a whirring ring of color on wheels as cars move down the road. Keeps Tires Inflated and Valves Clean The caps aren't just for aesthetics: they also help prevent air from leaking from tires while keeping valve cores clear of dust and debris. Specifics 4-pack of valve caps Powered by 3 LR1130 button-cell batteries (included) Product dimensions (each): 2.5"x1"x1"; 3oz.IGIA