This is a complete top end repair kit for KTM 85 SX Includes... - Piston Assembly (options to choose OEM Vertex, or Premium Wossner, or Pro-X cast) - Piston includes, ring or rings, wrist pin, wrist pin bearing and circlips - OEM KTM cylinder and power valve face plate - Complete Vertex top end gasket set - Helpful hint instructions with torque values - When purchasing this kit it is required that you send your old cylinder core in first!! These are hard to find cylinders. Once you place the order it holds the cylinder and other related parts for your order, however we will not ship the order until we receive your old core. Your old core cannot have an iron sleeve in it! Must be able to remanufacture it with Nicasil plating like factory. MAKE SURE YOUR CYLINDER IS NOT AN AFTERMARKET CYLINDER, PORTED OR IRON SLEEVED (IF YOUR CYLINDER FALLS INTO ANY OF THESE CATEGORIES WE WILL NOT BE ABLE TO PROCESS YOUR ORDER.