I've had them on both machines for a little over a year. They were so badly rusted that I had to cut three of the four off with a dremel on one machine and replace a valve stem on another machine. I do not recommend buying this product.
Pros
FEATURES: 1. Protects valve core from corrosion caused by direct contact with clay, water and snow. 2. Avoiding puncture and ensuring stable tire pressure. 5. Ensure safe driving.