and high qualityReusable foam boxSuitable for Bubble and Jetted Pure-spasfor Replacement of S1 cartonReplacing the filter of paper filter is part of the daily maintenance of the pool. These cleaning and reusable foam filters will reduce your costThe initial cost of the is slightly higher than that of the , the life is for a long timeMore durable than the carton, and it can be washed and reused many .: 2pcscolour:blueMaterial:spongesize:10.8*7.3 cmCenter hole drilling: .4 cmPackage Contents:2*Filter SpongesOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.