Review on Tactical Black USA Subdued Aluminum American Flag Valve Stem Cap with Rubber Ring - Set of 4 - Ideal for Cars, Trucks, Bikes, Motorcycles, Bicycles - Gadsden Snake Design by Cesar Hubbard

I've had mine for a few months now with no problems. They don't leak, the seal was airtight and I didn't have a single magic twist. I also bought a spare roadside assistance kit so I always have spares in case something gets lost or stolen. I'm not sure why some people mention they are "short", they are as long as standard plastic caps so I don't know what they were expecting. I strongly recommend buying them!