Box Two 9sp Rear DerailleurMade from strong and durable 6061-T6 aluminium, carbon fibre and nylon composite construction, this stunning model is more than capable of handling all that a long day in the mountains has to offer. Fast and smooth, this top-notch rear mech is packed with some of the finest features and technologies, making it perfect for tackling everything from the trails to cross-country riding.Features: Material: 6061-T6 Aluminium, Carbon fibre/Nylon composite Finish: Hard Onyx Speed: 9 speed Use: E-MTB Maximum Sprocket: 50T Weight: 290gTechnologies: Tri-Pack Limited Slip Clutch: The Tri-Pack limited slip clutch is an innovative chain damper that vastly reduces derailleur cage bounce and chain slap. The system also maintains tension for better chain wrap. At its core is a clutch pack, that is capable of providing a large amount of force in a small package. Durable 3D Forged Linkages: Impact resistance is greatly improved by way of forging – a key manufacturing process that strengthens critical components. Tested at the premier freeride event of the season – Red Bull Rampage – this new construction has proven itself capable of performing at the highest level. Pivot-Tech: Impact resistant, spring-loaded cable stay keeps cable, housing & you out of harm’s way.Buy Box Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.