Seeed all metal chassis 4wd robot kit atv includes motors fixings seeed studio 110990087 p the metal chassis 4wd robot kit from seeed studio is a heavy duty robot base with a box like aluminium alloy chassis its 78mm diameter wheels have a special grip pattern which is good for a wide variaety of surfaces from sand to grass supplied as a self assembly kit including the aluminium chassis motors wheels and battery holder plus shafts nuts bolts and tools p p seeed provide technic