With these optional pistons, it is now easier than ever to fine-tune suspension characteristics based on your needs. Made from precision machined self-lubricating Delrin, these CNC pistons have two large 1.7mm holes and four small relief holes. The TKR6731 Shock Pistons are for use in the Tekno RC EB410 1/10th Scale 4WD Buggy. *Shock shaft and screw sold separately.