This is a large servo saver from Traxxas. This servo saver mounts to the servo, and provides protection for your steering servo by allowing flex in the steering linkage during a crash.
Replacement part(s) for these models:
BIGFOOT NO. 1
STAMPEDE - NO BATTERY/CHARGER
STAMPEDE VXL RTR W/TSM
Stampede®: 1/10 Scale Monster Truck with TQ 2.4GHz radio system