[DURABLE] This bicycle valve is made of high-quality brass and closely matched with a rubber O-ring, which can effectively prevent leakage. The valve cover helps protect against corrosion from muddy water. [PRODUCT DESIGN] Lightweight, portable, and easy to install, this Presta to Schrader adapter allows you to simply loosen the tip of the Presta valve and screw on the adapter, enabling efficient inflation using various pumps or air compressors. [EXTENSIVE USE] These valve stem adapters are suitable for bicycles, road bikes, folding bikes, and most mountain bikes. They make tire inflation quick and convenient, enhancing your cycling experience. [YOU WILL GET] 12 x Presta to Schrader valve adapters, 24 x Presta valve covers, providing reliable support for your cycling needs. [MULTI-PURPOSE ADAPTER] Converts Presta valves to Schrader, allowing compatibility with standard pumps and air compressors. Color: Gold + Black Material: Metal + Plastic Size: Outer diameter 9.9mm, length approximately 12.7mm Package Contents: 12 x Presta to Schrader valve adapters 24 x Plastic Presta valve covers Note: Light and display differences may cause slight variations in color between the image and actual item. Measurement may vary by +/- 1-3cm.