Made of biochemical sponge,non-toxic and durable,harmless to the water and fish.
Size: Height 8cm/3.15in,diameter 4cm/1.6in, inner hole diameter 2cm/0.8in. Sponge cover is single-sided connected onto the water inlet of your filter. Prevent fine debris or particular matter into filter,improved filtering water effect.
High density design,will not block the flow of water into the filter.Easy to connect to the filter and easy to take out to clean.
Protect small fish and shrimp from getting sucked into the filter intake, it is good for their healthy growth.
Traps particles and debris, enhances biological filtration, prevents small and baby inhabitants from being drawn into filter.