This is the Traxxas Maxx Pre-Painted Monster Truck Body (Green).
Fits V.1 N arrow Maxx:
Is it time to upgrade your Maxx with an all-new look? These tough polycarbonate bodies feature the hottest ProGraphix® paint with pre-applied decals. ProGraphix bodies come fully-assembled and ready to mount with pre-installed body mounts, roof skid plate, and tailgate protector.