This is the MIP Ball Differential Rebuild Kit for the HPI Blitz. FEATURES: Metal plate and black nylon constructionINCLUDES: Two diff rings Twelve 2mm thrust balls Six 1.5mm diff balls One diff spring One diff clamp screw One 4-40 lock-nut One spring tube Clear grease Orange grease Two 8x4x3mm bearings REQUIRES: Assembly onto vehicle