Material: Aluminum alloy (4pcs) Best replacement for the old valve caps Stylish Lightweight Durable, anti-rust Easy install Features: Made of high quality chrome aluminum. Lightweight and unique design, durable, anti-rust. Best replacement for the old valve caps. Prevent dirt and water get into the inside of valves and potentially. Jamming or contaminating the selling surfaces and causing a leak. Descriptions: High performance and super exquisite workmanship. No tools required, easy installation. Best decoration and protection for your car. Specifications: Material: Aluminum Color: Black, Red, Yellow, Blue Size: Length:15mm, Diameter: 9mm Inner diameter of the bottom: approx. 7mm Package Includes: 4x Tire Valve Stem Caps