This is a brand new, never used Yamaha 1M1-11610-40-00 piston ring set, compatible with Yamaha DT250 and DT400 models. The set is designed to fit 4th oversize 1.00 pistons. The manufacturer part number is included in the aspects section, along with the brand and type of the item. This product belongs to the Other Brake Parts, Brakes & Brake Parts, Motorcycle & Scooter Parts & Accessories categories, which are all listed in eBay Motors.