New KOOZER 72HD Hub Front & Rear W/ Quick Release CNC Precision Technology Front:205g, Rear:305g, QR Skewer: 88g/F+R Material: AL7075 + CNC 2+4 Sealed NBK Bearings(F: 2, R: 4 Made in Taiwan), smooth and quite rolling O.L.D: F-100mm R-135mm Axle: F- 9x100mm, R-10x135mm Alloy cassette body Shimano 8/9/10S 6 pawls, 72 clicks per revolution of the freehub When rear axle rotating: it issued a crisp clatter