Eshopps Wd300 Filter Pad for Aquarium Filter Eshopps Filter Pads dense polyfilter pad helps increase the biological filtration capacity The Filter Pads mechanically traps unsightly debris from aquarium water and it is an easy way to improve mechanical filtration in nearly any filter Each filter pad comes in 6 per pack, Compatibility: WD-Series (model- WD-300CS) Material: Polyester Pad, Length: 12.75 in., Width: 11 in.