8T 10T 11T 12T 13T 14T 15T 16T 17T Ceramic Bearing Alloy MTB Bicycle Rear Derailleur Pulley Jockey Wheel Road Bike Guide Roller

Size: 8T 10T 11T 12T 13T 14T 15T 16T 17T

Bearing: Ceramic Bearing

Material: aluminum alloy 7075

Color:  Black Red 

Weight: about 7.8g

Fit for: 4/5/6 MM roller screw axis

Apply for: most of rear derailleur on the market