This piston ring set is a perfect fit for your Kawasaki A1 Samurai 250 A1R. It's brand new and has never been used before. The rings are designed to withstand the wear and tear of a race, ensuring a smooth and efficient ride. The manufacturer part number is 13008-016. These rings are compatible with all Kawasaki models and make. Upgrade your motorcycle with this top-quality set of rings today!