100% brand new and high quality, Reusable foam box. Suitable for Intex Bubble and Jetted Pure-spas. For replacement of S1 carton. Replacing the filter elements of paper filter is part of the daily maintenance of the pool. These cleaning and reusable foam filters will reduce your cost. The initial cost of the cartridge is slightly higher than that of the cartridge, but the cartridge life is longer over time. More durable than the carton, and it can be washed and reused many times. Size: 10.8 x 7.3 cm. Center hole diameter: Approx 4 cm. Note: It takes 2 hours for the compressed product to recover. Color: Blue. Material: Sponge. Package Contents: 16 x Filter Sponges. Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.