Welcome to our store！</br> 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. <p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> Item Type:&nbsp;Adjustable&nbsp;Air&nbsp;Refiner Weight: Approx.19g / 0.7oz Material: Plastic, Silicone, Cotton <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Oxygen Refiner Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>