This is an original Kawasaki output drive gear for off-road motorcycles. The gear is designed to fit vintage Kawasaki models and is made of steel. It is a second gear and has never been used, making it a new old stock (NOS) item. The gear has the manufacturer part number 13131-039 and was made in Japan. This gear is a great addition to any vintage Kawasaki motorcycle collection or for anyone looking to replace a worn out gear. It is not a universal fitment and will only work with specific models, so please check compatibility before purchasing. Buy with confidence knowing that you are getting a genuine Kawasaki NOS part.