This is an optional M2C Racing 12mm Delrin Tapered 8-Hole Shock Piston Set, and is intended for use with the Losi TEN, TEN-SCTE and 810 vehicles. These delrin pistons feature a hole design that tapers from 2.4mm to 0.8mm, allowing the vehicle to settle faster, providing increased turn in and improved rough track handling. If you race, these are a must have option for the Losi TEN family of vehicles!
NOTE: These pistons should be installed on the shock shaft with the tapered hole facing down. Also, M2C recommends 27.5wt Losi oil as a starting point, and that you bleed the shocks so they have either no rebound, or up to 5mm rebound.