This is the Ball Differential Rebuild Kit for the HPI Blitz and Firestorm Vehicles. FEATURES: For use with the HPI #103192 (HPIC3192) 52 tooth Racing Ball Diff set and the #103194 Ball Diff Set Steel construction YOU WILL RECEIVE: Two Diff Plates Nine 1.5mm Diff Balls Nine 3mm Diff Balls One Diff Bolt One Spring Three Washers One Outdirve REQUIREMENTS: Disassembly of differential lmm 8.19.10 &