TRP TR12 Derailleur and Shifter Box Set. Features: Rear Derailleur specs: Hall Lock; a B-Knuckle lock around the derailleur mount that reduces noise and increases shifting stability G-Spec Ratchet Clutch is adjustable and can be tuned depending on the suspension and rider style Carbon fiber outer cage and upper link; forged aluminum inner cage Extra wide parallelogram pivot 11t upper pulley and 15t lower pulley with sealed stainless steel bearings 12-speed chain required Shifter specs: Shift levers designed and located for optimum performance by Aaron Gwin Linear acutation for improved ergonomics and consistent thumb contact Enhanced grip & tactile feel built into lever paddles: embossed grooves on advance and release lever Carbon fiber upper housing and advance lever; forged aluminum release lever Ball bearing equipped Tool-free straight lace cable changes Rider adjustable home position of lower lever with a 40-degree range 5 upshift maximum 12-speed Also includes 1.1mm shift cable, 4mm housing, 4 x aluminum ferrules and cable end crimps Specs: Model:TR12 Speed:12sp Max Tooth Count:51t Weight:derailleur = 282g; shifter = 120g Color:black/black