[Healthy Safe]: The 0.5-micron diffusion stone is made of stainless steel, making it corrosion-resistant, high-temperature resistant, and durable. [Unique Carbonated Flavor]: The 0.5-micron diffusion stone produces smaller and finer bubbles, allowing gas to combine with liquid more efficiently. Ideal for draft beer, home-brewed soda, and other beverages to enhance smoothness and freshness. [Various Uses]: The 0.5-micron aeration stone is suitable for oxygenation and carbonation. Use it to oxygenate wort and carbonate beer or soda prior to fermentation. Also effective for other drink applications. [Connect with Fittings]: Attach the aeration stone barb to a 1/4-inch inner diameter hose. Connect the other end of the hose to the "gas in" post on a keg, then connect the keg to a CO2 regulator. [Boil for Cleaning]: The 0.5-micron diffusion stone should be boiled in water to clean and unclog pores. If blocked, it can be briefly dipped in acid for 15 seconds, then rinsed thoroughly with water. Color: Silver Material: Stainless Steel Package Contents: 1 x Defoaming Stone, 1 x Hose (50 cm) Note: Light and screen display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.