Features 1.Manufacturing Material: Made of high quality plastic, silicone and cotton materials, sturdy and durable, can be used for a long time, suitable for most air pumps. 2.Dissolved Oxygen Rate Improvement: The rotation can control the density of bubble size, and the uniform bubble can improve the dissolved oxygen rate. 3.Stable Suction Cup: Stable suction cup, can be firmly fixed, do not fall off. Replaceable cotton sheet, easy to disassemble and wash. 4.Rotation Control Design: Rotation control design can adjust the size and density of bubbles. Creates air bubbles, aids in increasing oxygen levels, lower CO2. 5.Easy to Use: Easy to use and fine workmanship. Without any difficult requirements even though you use it for the first time. Specification Item Type: Adjustable Air Refiner Weight: Approx.19g / 0.7oz Material: Plastic, Silicone, Cotton Package List 1 x Oxygen Refiner