Used brewed beer carbonization. The zero Micrometre stone is optimal to drive carbonate your kegged beer, or as an aeration stone earlier than fermentation. Colour: silver Material: chrome steel Size: about 48*7*12mm Package Contents: 1 x 0 Micrometre Oxygenation Stone Only the above package content, diversified merchandise aren't included. Note: Light and different displays can cause the colour of the article in the photo somewhat various from the genuine thing. The length allowed error is +/- 1-3cm.