From Team Associated:
These thinner shock pistons give you less “pack” inside the 12mm shock. Terrific for tuning in all kinds of track conditions, they are particularly helpful on carpet to help improve jump landings. Hole size is machined into each piston for easy identification.
Fits: RC10B74, B6.1, B6.1D, T6.1, SC6.1, B64, B64D.