This filter pad is well made of premium material for durable and practical use. It has the best effect on decomposing the excrement and the forage leftover. It can be used in sea water tank, fresh water tank, aquaplant tank. And its strong filterability can stable water quality and reduce fish died.Feature Color: As shown. Material: Sponge. Size: Approx. 50 x 11 x 2 cm. Effective to avoid residue and reduce the death rate of fish and chemical filtration and increase the oxygen solubility in aquarium and fish tank. Strong filterability. It can be used repeatedly after cleaning. Can be cut any size as your needed by yourself. Suitable for sea water tank, fresh water tank, aquaplant tank. Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understandThank you