Stem caps are good and I think they will work great. But I originally bought it for a keychain and checked out the stem caps as a bonus. On the 3rd day I got the keys out of my pocket and I heard something hit the ground and I looked around and the key fob was torn and the top was on the ground. The cheap rivet on the strap fell apart. I know it wasn't great, but I was a little pissed that I bought it for that reason in the first place.