Oh I love this thing! So I bought it a while ago. *Insert awkward definitive answer review at the very end*These valve stem caps are fresh as new, sleek and stylish. BIG, but with winter ending and spring turning rather nicely, it was just about time to replace my tires' winter air with quality summer air. Luckily for me the air is free, but free air doesn't really help when those valve covers don't even move, I mean like a hard-to-open cap completely stuck if you manage to doubt you belong. Masculinity in relation to your own level of exertion. To top it off, these baseball caps are not only sleek and stylish, they're razor sharp and not even beveled! So as you can imagine. By giving these caps an absolutely stern adult attitude and a bit of willpower, I managed to smash most of my fingers in the sky and, of course, remove about zero caps. DO, much to the chagrin of not only me but even my local dealer who couldn't remove these sleek puppies. At this point my dealer tells me (literally, as we say!) get new valve stems! That's not the end of the story though folks, as I'm trying to improve my father-to-be's game I decided to do some research on these little puppies! Aside from the fact that they are made in China, I was very surprised that this particular Chinese company specialized in them. I don't invent anything. Aquariums and glass/fish things! No kidding if you were to browse their site quite casually everything you could think of under the sun aquarium style is here as if I could even start investing in fish stocks at this point you would not find anything here but aquariums , not a single menu or tiny [my-NOOT] reference to valve stems. However! If you search their website AND tick the word "valve stem cap" you can actually find their little (metal) smooth cap supply line! **My suggestion: don't buy them, and if you do, maybe add a pack of bandages to your cart.