Enhance the health of your aquatic life with this 4\" X 2\" Air Stone Cylinder that comes in a pack of 20. Designed for both aquariums and hydroponics, this air stone cylinder is perfect for improving oxygenation and circulation in your aquatic environment. Crafted with high-quality materials, this air stone cylinder is durable and long-lasting, ensuring a continuous supply of oxygen to your aquatic life. Its compact design makes it easy to install and maintain, while its compatibility with both aquariums and hydroponics systems makes it a versatile addition to your aquatic life support system.