[Wide Compatibility] - Compatible with 8-12 speed systems, compatible with Sram setups, compatible with Sram X01 XX1 GX NX Eagle, ensuring versatile use across various bike models. [Low Friction, Smooth Riding] - Low friction and resistance for effortless riding, offering a smooth and noise-free cycling experience, enhancing overall performance. [Aluminum Construction] - CNC machined aluminum body with an anodized surface treatment, delivering durability and lightweight functionality at 13.5g/16.5g for 12T and 14T respectively. [12T and 14T Narrow Wide Teeth] - Specifically designed 12T and 14T narrow-wide teeth, optimizing chain engagement and retention for improved efficiency. [Package Contents] - Includes 2 pulleys and 2 adapters (5mm to 6mm) for .