Easily replace your Presta valve core with this high-quality set, designed to ensure long-lasting durability and excellent sealing performance. Crafted primarily from CNC-machined brass with a silver-plated chrome finish, it offers corrosion resistance and a professional look. The black gel ring and grid-structure head ensure a perfect air seal. Key Features Compatibility: For Presta valves with removable cores (not suitable for fixed valves) Core Material: CNC-machined brass + black gel ring Finish: Silver-plated chrome for long-lasting durability Dimensions: approx. 26 × 5 mm Weight: approx. 1.6 g per piece Performance: Excellent sealing and durability over time Ideal for road bikes, mountain bikes, gravel bikes, city bikes Replacement or periodic maintenance of Presta valves