Specification: Material: Polyurethane Color: Random Size: (Dia.)X(H)10.5X3.5cm/4.13''X1.38''(appr.)
Features 1) Suitable for HW-602/602B outer cylinder filter barrels. 2) Excellent water permeability. 3) Lightweight & softness design. 4) A good item ensures your filtering effect. 5) Dense shape makes it effective to avoid residue. 6) Suitable for using in freshwater and marine water. 7) Cultivate the nitrifying bacteria for biological filtration.
Note: when replacing the filter cotton, cut off the power of the filter bucket and the water source.