The X4 Rear Derailluer combines the best elements of SRAM shifting with a stylish design in an affordable price point. Intelligent material selection yields a lightweight high performance derailleur.  A compelling option for your 8-speed shifting needs. 

Speeds 8/9 Speed
Material Alloy B-knuckle , alloy outer link, Steel/Composite cage w/replaceable pulleys
Weight 280g long cage
Colors Black
Outer Cage Steel
Compatibility 1:1
Inner Cage Grilon Composite
Bearings Bushing
Cage Sizes Long 
Technology Highlight(s) 1:1 actuation ratio