This cylinder was certainly reconditioned professionally. I have a machine shop background and measured the it with micrometers upon receipt. Roundness was measured top, middle, and bottom. It was round to less than .001 inch. Taper was zero. These numbers are better than Polaris accepts as a factory new part. The ports were flawless, and final honing was excellent. The part was better than I expected and delivered quickly. Thumbs up on this one! Thank you for a great cylinder for my sled!