Features:
durability: Adopting aluminum alloy and ceramic material, this product is very durability to use, ceramic material can reduce drag force
FAST SPEED: Positive and negative tooth guide wheel, no strange voice and faster speed, can be applied for most mountain bike.
HERMETIC BEARING: The bicycle riding wheel is processed by anodized CNC.With a hermetic bearing for the center bolt derailleur,Very safe and practical.
SUITABLE FOR: With installation hole adapter tubes, 11T 13T professional test, guide wheel screws.Real technological innovations bring a whole new experience to your ride.
CONVENIENT FOR USE: Light weight, will not bring extra burden to the bicycle,you can better improve your ride. Make your cycling better.

Specifications:
Item: Bike Guide Roller
Material: Aluminum Alloy + Ceramic
Colour: Black, Golden (Optional)
Diameter: 4 cm / 1.6 inch (11 T), 5 cm / 2.0 inch (13 T)
Weight: 21-23 g

Package Included:
2 * Bike Guide Roller
2 * Installation Hole Adapter Tubes
(Other things on the pictures are not included)