Feature: 1. Perfect Fit: Replacement robotic pool cleaner filter cartridges are designed for Dolphin 9991425‑R4 robotic pool cleaner, ensuring perfect compatibility and effective cleaning performance. 2. Efficient Filtration: The ultra fine sturdy filter paper grabs sand, sediment and leaves more than regular fabric. Ultra fine cartridge filter panels allows for greater debris reduction. 3. Solid Structure: Featured thick pleated fabric with a strong support frame able to hold shape, which is hard to deform when pool water flows through. Robotic pool cleaner filter cartridges can withstand rough and frequent usage. 4. Washable and Reusable: The robotic pool cleaner filters are easy to clean for reuse, greatly saving your cost on the water bill, providing you with more time to enjoy the pool. Keep your swimming pool cleaner in its best condition. 5. Long Lasting: Easy to clean with a garden hose for reuse, greatly extending the life of the filter. Make sure to rinse the filter every 4‑6 weeks for optimal performance. Specification: Item Type: Robotic Pool Cleaner Filter Cartridge Material: PP, PET, Activated Carbon Weight: Approx. 336.00g / 11.85oz Product Size: Approx. 27.7x14.3cm / 10.9x5.6in Package List: 4 x Robotic Pool Cleaner Filter Cartridges