DetailsX.9 (9-speed):~ X0-style links and polished cosmetic finish. Compatible with ESP (1:1 ratio) trigger and twist shifters. Di.R.T (Direct Route Technology) for light-effort shifting performance. Aluminum inner/outer links and B-knuckle with Grilonª P-knuckle. Aluminum cage on medium/long and composite cage on short version. Hardened pivots and 11-tooth upper/lower pulleys. 230g (Long Cage).