OOTD Features : Application: It has the characteristics of light weight, high strength. It is and can help you clean your pool. Filleting effect: provides excellent filter effect. Stain absorption: they have a high ability to absorb dirt. High efficiency: they are lighter and more efficient than a traditional filter cartridge. Easy to care: they are easy to handle and you don't have any more sand in your pool. Specification: Material: SpongeSize: approx.6x6cm/2.36x2.36inColor: WhiteQuantity: 4pcs/8pcs/32pcsNote: Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Contents: 4xFilter Balls, or 8xFilter Balls, or 32xFilter Balls (Other demo accessories in the picture are not included.)