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This rear derailleur pulley is made of 6061 aluminum alloy, designed to reduce friction and increase stiffness. The steel bearing with rubber dust seal is for long-term use. And the CNC aluminum construction embraces corrosion resistance.

Features: 
High-tensile steel bearing with rubber dust seal and CNC aluminum alloy wheel.
Reduce friction, increase stiffness, enhance durability, for long use.
Used on rear derailleur for chain transportation and speed changing.
A replaceable 4mm bushing is included. (the 5mm one is configured)
Please refer to the size carefully before you buy it.

Specifications:
Color: Blue / Black / Gold / Silver / Red / Pink (Optional)
Model: 11T
Thickness: 8.4mm
Outer diameter: 41mm / 49mm
Hole diameter: 6mm
Bushing diameter: 5mm / 4mm
Package size: Approx. 10 * 7 * 1cm / 3.9 * 2.8 * 0.4in
Package weight: Approx. 11g / 14g 

Package List:
1 * Rear Derailleur Pulley