Features: Quickly release allows simple replacement in 30 second, crafted with durability metal alloys and wear resistant plastic for 2x longevity compared to standard bike valved cores. Features 6mm French valved stem compatibility, integrated rubber sealant rings, and copper construction to prevent air leaks while maintaining tire pressure stability. Essential for mountain bikers, road cyclists, and commuting riders needing reliability valved stems for emergencies repairs during adventures or daily rides. Performs optimally in long distance cycling, extreme weather conditions, and commutes where consistent tire pressure prevents safety hazards. Light weight French valved cores fit seamlessly in cycling gear bags, offering portable tire maintenance solution for trail explorers and travel enthusiasts. Specifications: Dimension:2.54cm/1in Component:copper Package Includes: 20pcs Detachable Bike valved Cores note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.