I really liked these. They corrode and stick to my valve stems. I had a nail in my tire and had to use pliers to get the cap off. Now I'm at Firestone and they can't take them off. Bad, not checked, but they should be metal.
Pros
EASY GRIP: Includes four (4) individual easy grip valve stem caps. Only suitable for Schrader valves. Each valve stem cap is 0.55" (1.4 cm) high and the resin-encased structure is 0.375" (0.95 cm) in diameter. Execution as shown.