The All Balls Swing Arm Bearing Kit comes with components made from 51200 steel - the near perfect material for bearings - which is why the components in All Balls' Kits are some of the toughest available. Everything you need to restore buttery smooth operation to your swingarm is included in this kit including all the bearings, shafts, seals, and bushings to bring your swingarm back to factory spec. Once the precision parts are installed you'll have a smooth glide throughout the travel of your swingarm with renewed protection against water and foreign debris that can prematurely wear out bearings.