Genuine OEM Mazda Joint Boot, part number FT4022540. This boot is designed to protect the inner constant velocity joint of the drive shaft from external contaminants such as dirt, water, and debris. It is crucial for maintaining the lubrication of the joint and preventing premature wear. The part is located on the inner side of the front drive shaft. Made from high-quality, durable rubber to withstand road conditions and ensure longevity.