Dedicated forging Superior strength/weight ratio utilizing Aerospace alloy Race proven designs Chosen by top race teams, in all forms of racing CNC machined Optimal cam shape and profile for peak HP and service life Precision machined, highest quality materials for strength and reduced friction High-performance ring set Extended life and sustained power Highest quality, alloy pin Consistently true and durable All Wiseco piston kits include 1 piston, 1 ring set, 1 wristpin and 2 circlips. Unless otherwise noted, top-end bearings, gaskets, and sleeves are not included. Note: All kits cover a single cylinder only Wiseco piston kits are sold by application and bore size. To ensure you receive the correct piston kit for your application, you must know the standard bore size to make sure you are ordering either the standard or correct amount of oversize that you need. If you have any questions, please email us. Wiseco Part#: 845M05400 Product Type: Single Pistons Specifications: Bore - Standard: 54.00mm Cylinders: 1 Bore - Oversize: STD Displacement: 125cc Bore - Actual: 54.00mm Note: Pro-Lite Stroke: 54.50mm Item Contents: 2126CS - 54.00 MM RING SET CW15 - ROUND WIRE PIN LOCKS 15MM (PAIR) S668 - PISTON PIN - 15 X 47 X 10.3MM ID