Material: Duck tire air cap is made of fluorescent resin and aluminum alloy with anodic oxidation process, bright color, not easy to rust and durable. The intensity of green light at night is influenced by sunlight exposure. Design: Cute valve stem cover with o-type rubber seal inside, better protect the valve core and stabilize tire pressure. Funny duck ornaments to add a different look to the car. Function: Glow at night duck tire cap cover can effectively prevent dust and water, prevent tire air leakage, ensure the safety of driving. Metal tire air cap can adapt to a variety of climates, resist the erosion of clay, rain and snow, protect the tire valve core. Compatibility: Auto tire stem caps are suitable for most bicycles, mountain bikes, motorcycles and pickup trucks in north america etc. Note: Tire caps only needs to be tightened by hand to be installed. If there are questions about the product, please contact us, we will do our best to resolve them for you. Rislobx 4Pcs Duck Tire Valve Caps, Funny Sunglasses Duck Valve Stem Caps Covers for Wheels, Decorative Cute Tire Valve Caps for Car Accessories