These are the RPM Black A-Arms for all versions of the Traxxas T-Maxx

Diameter: 40mm (41

Sealed bearings tend to hold up longer than open bearings in dusty conditions

If your original box is cracked or its sealing surfaces are worn

HPI Racing 101155 Receiver Box Trophy Truggy 4.6 HO Tracks These are the RPM BlackHPI Racing 101155 Receiver Box Trophy Truggy 4. 6 This is a genuine HPI Racing replacement receiver box for the Trophy Truggy 4. 6. The receiver box shields your radio receiver from the fuel, dirt, and moisture a nitro truggy throws around, keeping the most sensitive electronics on the truck protected. If your original box is cracked or its sealing surfaces are worn, this factory replacement restores full protection with a direct fit. Genuine HPI