This is a pair of Heavy Duty Traxxas rear Drag racing shocks for the Jato, Rustler and Bandit. These are a great length for either stock or short arms conversions.
These shocks are stiffer than stock and have more dampening to reduce squat and keep car planted on launch.
 
85mm length hole to hole
 
Choose either:
20 lb or 18.3 lb spring rate. Both work great so its just personal preference