4 PCS Valve Stem Caps, Glow Luminous Valve Stem Protective Cover, Auto Tire Air Caps, Universal for Most Cars (Pink)

Although they don’t work as 100% should but they are cute

They do glow for awhile after being in the sun all day, just not for an extended time. I thought the caps were going to be blue and not a blue insert surrounded by the luminous material that does glow blue.During the day you see this large clearish stem cap that does not look that good.They seem to be made quite well its just the size and the day time look that I only gave them 4 stars.GH

They are advertised as illuminating air cap valves that glow. These do not glow, they just bright and cannot be seen while driving. I wanted ones that “glow” so my wheel looks like it had colored on them an naw, these ain’t it.

These valve caps are pretty nice. They fit well, are thicker and sturdier than your bog-standard valve caps, and glow brightly! Unfortunately in most outdoor situations, you aren't going to notice them glowing much as they don't last forever, but if you happen to be in the right situation where they get charged up (such as if you go into a parking garage or tunnel during the day), they are easy to spot at a distance.Additionally, they have decent facets, being hexagonal, and so are very easy to loosen or tighten with your fingers.Finally, as they are a standard size for valve stems, they are not limited only to cars, but can also be placed onto most bicycles, motorcycles, or anything else with a standard schrader valve (like some scooters, lawnmowers, etc.). Especially given the price, these are a great purchase whether you're looking to replace broken/lost valve caps, or even if you still have all of your original caps!