Well worth ordering and shipping was fast too! I liked them so much I bought another pair for my brother and they will arrive tomorrow. Delivery takes less than a week
Pros
RUBBER O-RING - Dsycar skull valve stem caps have a rubber washer to ensure an airtight seal. This type of cap protects against dirt and moisture and also helps prevent air from escaping a slightly leaking Schrader valve. In addition, the rubber seal prevents the cap from loosening and falling off due to vibration and acts as a cushion between the cap and the valve stem.