1, It is made of Aluminum. 2, With Disc Brake Hub. 3, 8 speed Cassette Freewheel. 4, Bearing.

The Front Alloy MTB Hubs - Disc

Compatible To International 6 Balts DiscClassical MTB CX Disc HubWeight: 216gSpoke Holes: 32,36Gauge: 14P.C.D: 58mmFlange To Flange: 62mmSealed Bearing: 2Axle AL: 9x100x108mm

The Rear Alloy MTB Hubs - Disc

Compatible To International 6 Bolts DiscClassical MTB CX Disc HubWeight: 491gSpoke Holes: 32, 36Gauge: 14P.C.D: 58mmFlange To Flange: 58.4mmSealed Bearing: 4Pawls: 3Axle CrMo: 10x135x145mm

The Aluminum Hub with Disc Brake