4 Pcs Tire Valve Stem Caps Glow in The Dark Cute Duck Chicks Funny Design, Universal Fit Valve Stem Caps for Cars, Trucks, Bikes & Motorcycles - Tire Protection & Air Seal Decoration (Purple)

The very same day I put them on the ducks fell off when I was driving. Not sure when but they were gone when I reached my destination.

They are super cute and easy to install

when i received them i noticed immediately that they are made of glass.. also they don't glow. They broke in four days. the decoration snapped right off the purple base cap.

All the ducks broke/fell off within a month. Do not recommend.

All of these have came apart and popped off one the first drive with them.

These are cute! Nice way to add a little touch to something wheeled, or maybe play a little harmless prank on a friend.The bigger ones do protrude quite a bit that it may be good the be mindful about only using them on things where the valve stem does not significantly poke outward.If the listing didn't say resin I would assume glass based on the way they look and clink. They seem pretty sturdy, and beyond that they seem like if they were to break, it would be in a way that wouldn't compromise the function of the cap.They are glow in the dark but it's very faint and also short-lived. Pretty much if you go directly from direct sunlight to a dark enclosed space, you'll see them glowing green a little bit, but under normal circumstances where it gets gradually darker at dusk, they'll be done by the time it's properly dark.

They did not glow in the dark.Also, one of the glow pieces fell off somewhere.

UPDATE: THEY LASTED A COUPLE WEEKS BEFORE THEY STARTED FALLING OFF.Weather turned cool here in the south and the age old story happened... The magic cauldron appeared on my dash and my husband lost every single valve cap trying to appease the car cauldron.Last time this happened I ordered some adorable penis shaped caps which fell apart quickly (3D printed) and my husband said no more penis' on my car.Okay fine. So I ordered these chicks. In purple. His favorite color.Its not my fault to larger of the chicks has a distinctly phallic shape.THEY'RE ADORABLE.And I like that the actual cap part is metallic feeling. They feel very durable. But the bigger ones are very tall. The first time my husband hits a curb I'm worried they'll pop off. But in the meantime I'll enjoy them and how adorable they are.