Features: Enhances nighttime safety with our glow under dark valves stem caps that automatically illuminate in dark , boosting visibility for riders and ensuring easy detection by other vehicles during low light conditions. Crafted from strong ABS component , these tire valves caps feature excellent effect resistance and weatherproof performances, allowing for quick, tool easy installation with a simple twist for easy use. Ideal for night commuters, long distance cyclists, and motorcycle enthusiasts who prioritize safety and need stable accessories for enhanced visibility in dim environments. Perfect for scenarios like evening commutes, adventurous rides on complex terrains, or any low light driving situations where increased tire visibility is essential for accident prevention. suitable bicycles, motorcycles, and cars, these valves stem caps recharge using natural light, eliminating battery dependency and supporting sustainable, energy efficient travel solution. Specifications: Component : ABS Size: about 1.7x1.3cm/0.67x0.51inch Package Includes: 12xLuminous valves Caps or 20xLuminous valves Caps or 40xLuminous valves Caps note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.