Features:
CNC 7075 aluminum alloy, super light and durable.
Fit for 4/5/6mm roller screw axis.
Apply for most rear derailleurs.

Specifications:
Material: Aluminum alloy 7075
Color:_ Black / Red / Blue / Silver / Golden (optional)
Structure: Ceramic bearing
Size: 11T
Weight: About 7.8g

Package List:
1 * Jockey Wheel