Features: Four bearing wheel bring extremely low frictions, with almost none resistance felts during cycling, easy accelerations, and long terms stability. The internal structures is precise, coupled with 120 sound precisions adjustment, ensuring extremely smooth rotation everytimes. The quickly release levers design is strong and easy to operate, allowing for quick disassembly and assembly of wheel with a hand, making daily maintenance convenient. The bucket shafts systems provide more precise tension adjustment, which can better adapt to different spokes tensions, ensuring that the flower drum remain stable and accurate even under extreme conditions. It have excellent wear resistance and can bear long terms highly intensity cycling tests. Specifications: Component: Aluminum alloys Type: Front 28 hole/Front 32 hole/Front 36 hole/Rear 28 hole/Rear 32 hole/Rear 36 hole Color: Black/01/02/Colorful Length: about 135mm/5.31inch Package Includes: 1set Mountain Bike Rear Hub note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.