This Volvo Penta U-Joint Bellows Kit is a genuine OEM part with part number 21277185. It is designed for use in sterndrive motors and components for boats. The kit includes all the necessary components for proper installation and function. The brand of this kit is Volvo Penta, and it is manufactured in accordance with strict standards. It is compatible with a wide range of boats and boat parts. Please note that this product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. If you have any questions or concerns about this product, please feel free to contact us.