Features: This diffusion stone is used for home brewed beer carbonization, more convenient to use. High efficiency, with the help of the aeration stone, your beverage can be carbonating easily. Made of high quality stainless steel material, which is corrosion resistant and durable in use. Easy to clean and easy to use, this diffusion stone is a practical accessory for beer brewing. The stone is ideal to force carbonate your beer, or as an aeration stone prior to fermentation. Specification: Condition: 100% Brand New Material: Stainless Steel Use: for home brewed beer carbonization Total Length: Approx. 48mm / 1.9in Upper Diameter: Approx. 7mm / 0.3in Bottom Diameter: Approx. 12mm / 0.5in Type: 0.5 Micron, 2 Micron (optional) Weight: Approx. 16g / 0.6 oz Package List: 1 x Diffusion Stone Note: 1. Please allow 0-2 mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.