When the cute duck's valve is exposed to sunlight, the fluorescent material begins to absorb the energy of light, and when the light disappears, it begins to emit light,Valve caps can protect the valve, prevent the water, dust or sand into the tyre; preventing the valve from leaking, ensure the safe driving,4pcs valve stem caps, it's can easily tightened use your hand. Beautiful appearance, fits vehicles of various colors，and these are great car accessories gifts for men,The valve cap is made of good quality and durable aluminum alloy and resin material, enhanced seal to help prevent air leakage,Universal size fits more cars, bus trucks, SUVs, motorcycle, bike or bicycle.