Review on 🚗 40 Pieces Tire Stem Valve Dust Caps - 20 Pack Colorful Aluminum Car Wheel Air Covers with 20 Pcs Black Plastic Dustproof Tire Cap for Cars, Motorbikes, Trucks, Bikes, and Bicycles to Prevent Air Leakage by Derek Davie

They are beautifully crafted from anodized aluminum. However, make sure you mount them before your tire is balanced as the weight is heavier than the original. They can throw your wheel off balance as far as I'm not sure, but it gave me noticeable vibration. So I waited until I had to balance my tires under warranty and flip them and put them back on and the tire dealer said they needed to rebalance the tires where they were unbalanced. Their little vibrations are driving me crazy Definitely worth the price and look great on my cars.