Pistal pistons are top quality. This set are a big bore conversion for a Ducati 748; The Biposto or monoposto version. Your standard cylinders will need to be bored and replated; they will take the capacity out to 870cc. The kit include two pistons, two sets of rings, two piston Pins and the relevant circlips. It can also be used in an SPS if care is taken to ensure the valve pocket clearances are correct.