18Pcs for Intex Pure Spa Reusable Washable Foam Hot Tub Filter Cartridge S1 Type and high quality,Reusable foam box. Suitable for 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 is slightly higher than that of the , but the life is longer for a long time. More durable than the carton, and it can be washed and reused many times. Size: 10.8x7.3 cm Center hole drilling: 4 cm Material:sponge colour:Blue Package Contents: 18 x Filter Sponges Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia