This product listing refers to accessories for the Boboduck Wearable Breast Pump and Electric Hands-free Breast Pump. These accessories likely include replacement parts, additional flanges in various sizes for optimal comfort and fit, spare valves, tubing, collection cups, or other components that enhance the functionality, longevity, or hygiene of the Boboduck breast pumps. They are essential for maintaining the pump's performance and ensuring a comfortable and efficient breastfeeding experience. The 'F5071' likely indicates a specific model number or accessory kit.