All new 120 engagement Whistler Pro cassette hub is Demolition's most responsive cassette to date. Features a lightweight 6061-T6 aluminum hub shell, straight 14 mm heat-treated CRMO axle w/ allen insert for easy removal. 2 large sealed bearings in hub shell. 3 bearings in the 1-pc 6 pawl driver. Now included both drive and non-drive side hub guards.

Shell Material: 6061 CNC aluminum

Axle Material: 4140 Hollow CrMo HT

Weight: 410g.