Specification: Condition: 100% Brand New Item Type: Diffusion Stone Material: 304 Stainless Steel Color: Silver Connection: 1/4 Inch Outer Diameter Barb Length: Approx. 48mm / 1.9in Diameter: Approx. 13mm / 0.5in Weight: Approx. 34g / 1.2oz Package List: 2 x Diffusion Stone Note: 1. Please allow 0-2 cm 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. A Must Have: The stainless steel aeration stone with millions of pores, so this diffusion stone will quickly oxygenate wort and carbonated beer/soda water before fermentation. Easy to Use: The 1/4 inch barb can be easily connected or disconnected, which is convenient and practical, reliable for brewing accessories,connects inline with any kettle, pump, or counterflow/plate wort chiller. Durable: This stainless steel aeration stone is made of 304 stainless steel, which makes the in‑line aeration stone corrosion resistant, high temperature resistant and durable. How to Clean: In order to clean your diffusion stone, we recommend that you simply boil the oxygen diffusion stone in water for 1‑3 minutes. How to Use: Avoid clogging the s of the oxygen stone, do not contact the body of the diffusion stone with your hands. The grease on the fingers will block the small pores on the stone.