High Quality Material Made of PU sponge, soft and lightweight oil absorbing sponge is durable with long service life. Superior Absorption Capacity Absorb about 40 times of its own weight in oil, slime, grim and other types of scums. Help to reduce the load on the filtration system and filter. Washable and Reusable When the sponge gets saturated, simply squeeze out the oil, rinse out the sponge, and use again. It would be at better performance after cleaning the sponge. Read more WARM PROMPT: Please do not put the sponge on the water which exceeds 50 , otherwise it is easy to turn yellow.