Compatible with Dolphin Premier, DX6, Deluxe 4, Deluxe 5, DLX4, DLX5 Robotic Pool Cleaners, Part Number: 9991425-R4（4 pack） Ultra fine filter with more pleats for maximum filtration efficiency, removes smaller particles easily and get a sparkling pool. Keeping your pool cleaner in it's best condition. The ultra-fine sturdy filter paper grabs sand, sediment and leaves more than regular fabric. Allowing for greater debris reduction,keeping your pool bottom crystal clear. Make with heavy-duty ABS plastic, the pool robot filter is high resistant to rip,not easily deformed when pool water flows through, providing overall structural stability. Package includes:4 pack pool filter replacement for Dolphin pool cleaner Compatible with Dolphin Premier, DX6, Deluxe 4, Deluxe 5, DLX4, DLX5 Robotic Pool Cleaners, Part Number: 9991425-R4（4 pack）