500 x 5 Super high energy magnesium wheel and brake kit. Static load capacity:1260, limit load 4550 lbs. Brake rating in kinetci energy capacity 289,000 ft/lbs. Each kit contains 2 each: CWB40- 151 wheel assemblies which include 2 each CWB164-85 discs, and 2 each CWB30-164 brake assemblies with 4 each CWB66-62 metallic linings. Use AX 5 – 1-1/4″ axles, A484 spacer and 1 – A484-4357 spacer per axles with MS21025-20 nuts.