Surface is rough so carbon sticks to it easily. The skirt is paper thin compared to competitors, better have a perfect cylinder. valve seat edges are rounded off. Oil orifices are only on two sides of the piston. Stock performance. Will be my first and last pro x personally.
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Simply the replacement piston. Allows for cylinder wear by offering 4 sizes to make compression readings as optimal as can be.
The fact that it comes as a kit makes it that much better so you every thing you need all in one box.
You have a reference in your "book" as a bore size. You ALWAYS need to measure the bore size before ordering a piston and refer to the factory service manual to determine the correct piston for your bore size with the tolerances listed within that service manual.