Item includes : 4pcs Piston, STD size 4pcs Piston Pin 8pcs Piston Clips 4set Ring set for 4pistons. STD size We also can supply the following parts for Yanmar engine rebuild, any parts you need, please let us know: Valve (intake, exhaust, seat and guide), Bush, Main and Con rod bearing. Water pump, Oil pump, Fuel pump, Crankshaft, Camshaft, Connecting rod. 4TN78-RJB 4TN78 Piston Kit With Ring For Yanmar John Deere JD50 YB501 Excavator. 4pcs Piston, STD size. 4set Ring set for 4pistons. Note : Please confirm which size you need For the bearing set, If no extral Requirement we will send STD Size, Thanks. We also can supply the following parts for Yanmar engine rebuild, any parts you need, please let us know. Valve (intake, exhaust, seat and guide). Bush, Main and Con rod bearing. Water pump, Oil pump, Fuel pump. Crankshaft, Camshaft, Connecting rod.