Features:1. Add Oxygen to keep water roots healthy, put fishes live at ease. 5 sizes can be selected to meet your different needs.2. Good heat dissipation, sufficient and even oxygen. Can be used with air pumps (without air pumps).3. Air stones allow the aquarium to create beautiful walls of bubbles that not only look good, but also help aerate and circulate the water. An important tool to successfully guarantee the respiration process of aquatics fish.4. This product can effectively release many uniform and delicate bubbles for your fish tank.5. Keep the water clear and healthy, so that the fish can live more comfortably. Notice:1.Actual color may be slightly different from the image due to different monitor and light effect2.Please allow 1-3cm deviation due to manual measurement Description:Weight: 6.7g/inch Specifications: 4 inches, 6 inches, 8 inches, 10 inches, 12 inchesNotes for use 1: Please soak this product in water for 15 minutes before use.2: Long-term use, such as dirt clogging, bubble reduction, can be taken out to clean repeated use.3. length 4-12inches of air strip with 2W and above air pumps can be used. Dear customers: the greater the wattage of the air pumps, the better the effect of air Oh 4. This product is only the air strip, without the air pumps and air tube. Need to use with the air pumps and air tube.