<b>Makes Lots of Bubbles</b> <br> <br>♦ Aquarium air stones moderate in size and outputs a large steady stream of tiny bubbles, no leaks, add enough oxygen to your fish, and also make your fish tank more beautiful. <br>♦ Air stones extend the life of your nutrient solution, help keep roots healthy, and promote exceptional growth. This stone is a must have for your aquariums. <br> <br><b>Notes</b> <br> <br>♦ Please soak the air stone in water for about 1 hour before first use. <br>♦ If the air stone doesn't have bubbles in one part, please change the pump of higher power. <br>♦ After a long-term usage, please clean it if bubbles lessen. <br> <br><b>Specifications </b><br> <br>1. Color: Grey <br>2. Material: Silicon carbide, Plastic <br>3. Suitable occasion: fish tank, aquarium, ponds and so on <br>4. Size: approx. 1.6 x 0.6" (40 x15mm) <br>5. Net Weight: 31g <br> <br><b>Package Included </b><br>4 x Air Stones <br>2 x Three-way splitter <br><br><b>Money Back Guarantee: If you are not satisfied with our aquarium air stones or have any problem with them, feel free to contact us, we will refund or resend to you.</b>