Usage Tips:[Presenting the Best]steel bearing offers distinguished smoothness to your paddling. Being 58% lighter and 120% harder, the pulley grants creamy chain rotation with notably less friction and noise. [Oversized Pulley]14&16-Tooth oversized design with wide and narrow tooth shapes. Offering precision in chain engagement, ultra smooth performance and significantly reduced friction. [Derailleur Compatibility] Fits For GX AXS eagle12 with the least drag ever. [Longer and Further]Boasting incredible durability and the greatest longevity, TRiPEAK steel bearing pulleys are designed to maintain performance across lifetime. [Off Road, Of Course]Waterproof, dustproof, and anti-deformation. Runs on perfectly sealed bearings, keeping the gunk out and your riding experiences intact. Material: plastic+metal colour: black Package Contents: 2 x guide wheel with positive and negative teeth (14T+16T) 4 x washer 1 x wrench Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.