This aquarium filter pad is made of for durable and practical to use. It can be used in seawater tank, fresh water tank, aqua-plant tank. And its strong filter ability and high density design can stable water quality and reduce fish died. Features -Color:Assorted Color -Material:Artificial cotton -Size:32.00X12.00X2.00cm/12.58X4.72X0.79in (blue) -Size:64.00X12.00X2.50cm/25.15X4.72X0.98in (white) -The filter pad make by great material and fine workmanship highly efficient filtration of impurities in water. -This practical filter pad with high density can purify your fish tank, a nice helper for you. - will not pollute water and can keep . You cut it into various shapes to meet your needs. -The multi-functional filter pad has plenty of surface area to create good biological filtration. -The filter mat can avoid residue and reduce the fish death rate, increase the oxygen solubility. Package list: 4 x White Filter Pads 6 x Blue Filter Pads