Primo Balance Freecoaster material: cnc machined 6061 aluminum hub shell | 17mm Hollow Heat-Treated Chromoly female axle | 1-pc chromoly driver style: RHD (right-hand drive) axle size: 14mm male axle driver: 9 teeth spoke holes: 36H bearings: * color: matt black additional information: 2 plastic hubguards are included, drive side and non drive side