Features: Premium Brass Construction: The 7/11/14pcs professional brass presta valve core set is crafted from quality brass, ensuring durability and corrosion resistance for long-lasting performance on road bikes and various bike tire models. Leak-Proof Design: Featuring a precision-engineered leak-proof valve core, this set effectively prevents air leakage, maintaining optimal tire pressure for smoother rides and enhanced safety on the road. Universal Compatibility: Designed as a universal presta valve core set, it works seamlessly with road bikes, and various tire models, offering versatility for cyclists of all levels. Multi-Pack Options: Available in 7/11/14pcs sets, this presta valve core kit provides ample replacements or backups, ensuring you're always prepare for tire repairs or upgrades. Intimate Service: We are committed to providing customers with high-grade after-sales service. If you have any questions,you can contact us,and we will solve them for you until you are satisfied. Specifications: Material: Brass Valve Core Size: 2.5*0.5cm Note: Due to the screen lighting effect, the actual color of the product may be slightly different. Due to manual measurement, please allow size error. Include: Choice1: 1*Brass Presta Valve Core Set (7pcs) OR Choice2: 1* Brass Presta Valve Core Set ( 11pcs) OR Choice3: 1* Brass Presta Valve Core Set ( 14pcs)