3D printed Shock Cups for use with Mini T springs (or similar).  The design of these cups always for easy preload setting changes without having to take off or disassemble the shocks.  Shock cup set includes 4 of each of the different preloads (2mm, 3mm, and 4mm) for a total of 12 pieces.  These work with traxxas big bore, element RC, axial and dravtech shocks or an other shock with a 5.8mm or smaller rod end on the shock.