The package contains: There are 3 shrimp filter protectors and 3 sponges. These air intake filter covers protect against small fish and shrimp being sucked into the filter and causing death. Material: Stainless steel, sponge. Please pay attention to the solder joints of the wires when washing your hands. The wire mesh may be deformed during transportation, you can pinch it yourself and gradually return it to its original shape. Size: The shrimp filter protector measures 8.5 * 3cm. The sponge measures 8*4cm. The inner diameter is 16mm. The shrimp filter can prevent large pieces of waste, aquatic plants and leaves from being sucked into the filter. Easy to use: The shrimp filter cover is easy to use and can be directly inserted into the hard pipe of the water inlet to effectively prevent the inhalation of small shrimp and fish, and extend the use time of the filter material in the filter. Application: The shrimp filter protector is suitable for all kinds of external filters with water inlet pipe outer diameter of about 12mm or 16mm, which can make your water inlet pipe cleaner, reduce the dirt deposit from the water pipe and reduce the flow attenuation of the filter cartridge.