This PMA part is a direct part replacement for Airbus Helicopters P/N 350A75-2095-20 and fits on most AS350 and AS355 helicopters. This part is made out of a stronger stainless steel (17-4) than the OEM and it comes chrome plated on the two main journals that wear the most to increase part life. This part is FAA approved. Use the promo code PISTONPAIR to receive $100 off at checkout when buying a pair of pistons.