Ziliny Aquarium Foam Filter Pads Compatible with Fluval Fx4, Fx5, Fx6 Cartridge Filters 30ppi Replacement White Pads(30 Packs)Brand: Ziliny Features: Please Note: it will be vacuum packed when you receive it, unpack and let it sit for 2 days, the product will return to its original state; If you want to use it as soon as possible, peel your filters apart and throw them in the drier for about 3 minutes and they will regain shape; No need to wait 2 days Size Information: the size of aquarium filter pads is about 15. 16 x 3. 35 x 1. 57 inch 38. 5 x 8. 5 x 4 cm, the aperture is