Characteristics: 1. Made of high-quality plastic, which is strong and durable. 2. Equipped with suction cups to ensure stable installation of the product. 3. It will achieve better results when it combines biochemical, sponge and physical filtration. 4. Removable, washable, cotton filter can be replaced. 5. Two sizes to choose from, it's easier to decide which one suits you best. Specification: Material: plastic Color: as shown in the photos Type: LH300 Size: LH300: 189 * 67mm / 7.4 * 2.6in (H * bottom diameter) Package List: 1 * filter 4 * Suction cup How to install: 1. Use the air tube to connect the product with the air pump. 2. Connect the air pump, if there is water or bubbles coming out of the water outlet, it means it is working normally. If the air pump is lower than water, install a check valve. Note: 1. The fluid bed floats at first and needs to be soaked in water for 1-2 days to achieve suspension and tumbling. 2. It should be connected to an air pump.