Sram X4 Rear Derailleur

This is a 7 or 8 speed rear derailleur that is compatible with SRAM 1:1 shifters (triggers and twisters).
It has a 1:1 actuation ratio & Direct Route Technology for lighter effort shifting.
It also has an alloy B-knuckle, a Zinc alloy outer link, a new inner link system and a steel/composite cage with replaceable pulleys.
Weight: 325 long / 315 medium.