If you are looking for a fish tank filter with reliable material and , I will tell you that our filter sock will be your . We adopt good PP material, can keep it for a long time. The fish tank filter is easy and convenient for you to use. Features -Color:As Shown -Material:PP -Size:19.00X10.50X10.50cm/7.47X4.13X4.13in - Made of high grade material, it doesn’t interfere with your fish tank's other accessories. - Salt water tank filter socks trap debris and help reduce the amount of unsafe producing objects in the tank, providing a healthy environment for the tank. - Can remove excessive food, fish debris in your aquarium’s water and fish tank effectively. - Purify your fish tank with this 3D honeycomb designed filter bag, a nice helper for you. - Easy to replace it regularly so that these things won't cause any problems for a clean environment. Package list: 4 x Filter Socks