These wheels will only fit Traxxas TRX-4M.Includes:4 Wheels with hardwareFeatures:CNC machined brass wheelsStandard 1.0" wheel sizeStandard 7mm hex mountInternal Beadlock systemFits all 1.0" tiresFeatures:Outer Diameter : 31mm(1.22")Width: 12.8mm (0.5")Hex Mount : 7mmWeight: 37g (1.3oz) per wheel