Prox Racing Parts (01.6105.D 46.98mm 2-Stroke Piston Kit Fits: KTM 85 SX 2003-2014 Ready to install, ProX Piston Kits are supplied complete with piston rings, wrist pin, and circlips ProX pistons are precision machined on the latest, state of the art CNC equipment and use the same low-expansion, low-friction piston alloy all major Japanese engine manufacturers use Uses a moly coated skirt that not only assists the break-in process, but also helps reduce friction and increase performance for the life of the piston Notes: 46.98mm bore