Box One 11sp Rear DerailleurNow boasting improved stability, this high-quality 11 speed rear mech delivers a light shift operation with less effort. Easier to adjust, greater efficiency and smoother driving are all key factors provided by this superb model which makes life easier on tougher trails.Features: Material: 6061-T6 Aluminum, Carbon fibre/Nylon composite Speed: 11 speed Compatibility: Box One or Box Two 11 speed shifters Maximum Sprocket: 46T Minimum Sprocket: 10T Pulleys: Precision sealed bearing Forged inner and outer cage Weight: 288gTechnologies: Adjustable Tri-Pack Limited Slip Clutch: The Adjustable 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. Clutch force can be adjusted to give the user the ability to tune their setup to the desired balance of shifter feel and chain retention. This version is also serviceable. 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 harms way.Buy Box Components from Chain Reaction Cycles, the Worlds Largest Online Bike Store.