If you're trying to be funny and put them on your friends' bikes, don't try to buy them. These are NOT valve stem caps. First, they are unthreaded, and second, the tiny hole doesn't fit the valve stem, let alone the cap. Basically they are tiny dildos with tiny holes at the bottom. Don't waste your time or money. The only way to decorate someone's car with this is to use some crazy glue, and that's taking it too far unless the victim is full of shit.