This mountain bike aluminum alloy rear derailleur guide wheel is engineered for optimal performance. This derailleur pulley enhances your bike's overall efficiency and reliability, allowing you to tackle challenging trails with confidence. Features -Color:Black -Material:Aluminium alloy -Size:10.00X10.00X4.30cm/3.93X3.93X1.69in -Material quality: constructed from durable aluminum alloy, this rear derailleur pulley is built to withstand the rigors of different riding conditions - adaptability: various complex terrains, making it a versatile choice for mountain biking enthusiasts -Weight efficiency: the lightweight design reduces the overall weight of the bike, enhancing maneuverability and control for the rider -Practical: This mountain bike aluminum alloy rear derailleur guide wheel is engineered for optimal performance -Smooth operation: the 11 tooth bearing system ensures smooth and efficient chain movement, improving the overall shifting performance of the bike Package list: 1 x guide wheel