TORRENT OEM bearing and seal kits are made from original KOYO bearings, and OEM Yamaha seals. There are no corners cut ever with our selection of parts or installation service. Our Ninja bearing kits are hand selected to the tolerance and fit that our pumps are machined to. The Ninja bearing is the only of its kind and special to our pumps only. Bearings come in ranges of sizes and tolerance fits. Each batch of our bearings are hand checked for fitment in Torrent Pumps before leaving our facility, ensuring you get a quality part each and every time. No out of the box problems.