The specialized custom neoprene chainstay protector the custom fit of the chain protector gives it a more intergrated look while protecting the frame specialized custom neoprene chainstay protector features quiets derailleur and chain contact compression moulded 5mm25mm neoprene black abrasion resistant outer covering with stitched edges for durability rubber printing on the inside surface keeps the sleeve in place derailleur housing stop cutouts for a precise fit custom fit