The Primo Balance V2 Freecoaster Hub now features a cnc machined chromoly 14mm male axle. The shell itself is forged and CNC machined from 6061-T6 aluminum and utilizes 2 sealed cartridge bearings. The Balance V2 uses an internal clutch system (no spring/balls system on the axle). 1-piece chromoly driver with an oversized needle bearing for increased durability. 2 nylon Primo hub guards included.