If you are searching for a suitable fish tank bubble stone, please check out our product. Our Bubble Stones for Aquarium are designed with high end mineral material, for your safe and long-term using. The bubble stone does well in making water flows and natural underwater sight, making your fish tank more attractive. It serves to add fresh air into the tank water, keeping the water healthy and lively. Features -Color:Multi -Material:Sand, plastic -Size:5.00X3.00X3.00cm/1.97X1.18X1.18in -Made up of reliable and reusable material, our Air Pumps for Fish Tank are able to create water flows and bubbles, adding fresh oxygen to the water. -With constant fresh air, your can keep the water healthy and lively for lasting time. -If your fish tank or aquarium is large enough, you can put several bubble stones together in one, as a way to offer sufficient oxygen for . -The air stone is easy to install and clean. You can just put it where you think is necessary and clean it as easy as you wash you hands. -You can also send some of our bubble stones as gifts to your friends who are fans of keeping in fish tanks, showing them your care. Package list: 15 x Bubble Stones