ITEM NAME:4 inch Length Green Air Stone Bubble Diffuser Bar for Aquarium Fish Tank 20 V7X5 4 inch Length Green Air Stone Bubble Diffuser Bar for Aquarium Fish Tank 20 V7X5 Fit for freshwater, saltwater aquarium and hydroponic use.Widely used to increase the dissolved oxygen level in the aquarium. Air stones allow the aquarium to create beautiful walls of bubbles that not only look good, but also help aerate and circulate the water. Instantly create a great deal of tiny bubbles that your fish will love.Creating a dramatic and funning mist of healthful bubbles in your aquarium. Evenly distributes fine bubbles through a super-porous, non-clogging wand.The bubble wall air diffuser makes a great addition to any aquarium and will add great movement to your tank. It is an important instrument to successfully keep aquatic fish for respiration process. It is an important instrument to successfully keep aquatic fish for respiration process. Add Oxygen to keep water roots healthy, put fishes live at ease. When it is clogged with dirt or creating bubbles with low quantity, please wash it for re-used. Please soak it in water for at least 15 minutes before use. Color: Green Material: Sand + plastic Total Size: 115 x 18 x 10mm/ 4.5 inch x 0.7 inch x 0.4 inch (L*W*T Note: 1.The need to be connected with your pump(Not Included). 2.Please soak it in water for at least 15 minutes before use. Package Content: 20 * fish tank oxygen stone Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Air stones allow the aquarium to create beautiful walls of bubbles that not only look good, but also help aerate and circulate the water. Fit for freshwater, saltwater aquarium and hydroponic use.Widely used to increase the dissolved oxygen level in the aquarium.