This is a brand new Kawasaki piston ring set, part number 13024-041. It is an original OE product and is compatible with Kawasaki motorcycles, specifically the S1, KH Mach I, and KH250 models. The ring set is sized at .040 over standard, ensuring a perfect fit for your motorcycle. This is a great opportunity to replace your old or worn out piston rings with a high-quality OEM product.BOX8