The product is a genuine OEM Yamaha crankcase designed for freshwater WaveRunner XLT 800 and GP800 models from 1998-2005. This high-quality part is manufactured by Yamaha and comes with the numbers 66E-15100-00-8P, 66E-15100-10-00, and 66E-15100-10-8P. It is essential for the proper functioning of the personal watercraft, ensuring durability and compatibility with the specified models. Ideal for maintaining or restoring your Yamaha WaveRunner, this crankcase is a reliable and authentic component from the manufacturer.