600×6 kit with magnesium wheels and aluminum brakes. Static capacity: 2500 lbs. Each kit includes 2) CWB40-75B wheel assemblies, 2) CWB164-15A brake discs, CWB30-52 brake assemblies w/CWB66-105 linings. Use AX6 1-1/2″ axles and MS21025-24 nuts. Magnesium NOT compatible with salt.