Yokomo BD10 short shock taper pistons
Coming from Yokomo and made for their BD10 touring car are new tapered 1.0mm 4-hole pistons. They feature a special, tapered design that provides different shock characteristics on compression and extension with the tapered shape resulting in quicker extension and increased “pack” upon compression. In addition the piston holes sit at an angle which means even when running softer oils the shocks offer a harder pack on quick inputs while absorbing micro vibrations and smaller road imperfections, keeping the wheels to the ground more effectively.
Source: Yokomo [teamyokomo.com]