This is a 5-port DI cylinder for the Sea-doo watercraft that have the 947 direct injected engine in them. The cylinder has been cleaned, bored oversize, honed, and chamfered. It is at 1mm and is ready to accept new pistons and to be installed. Only issue with the cylinder it the upper mating surface. It has some impact marks on it but should not be a problem. You might want to use some gasket compound in that area to insure there are no leaks. Issue can be seen in the last photo. I can also get you a top end piston kit to go along with this cylinder for an extra $250.