Feature (1)Air stones are made of high quality non-toxic mineral material. With high temperature sintered, stones are sturdy and durable, have high dissolved oxygen rate and create even and tiny bubbles rather than a limited number of large ones (2)An airstone, whose purpose is to gradually diffuse air into the tank and provide oxygen for fish to breathe, is a necessity to have around your aquarium if you are a lover of aquatic animals. It’s also a must have for Hydroponic and Circulation system. Material: High quality non-toxic mineral material Size: Diameter: 10cm / 4 inch Height: 6.5cm / 2.5 inch Color: Grey Suitable occasion: Fish tank, aquarium, ponds and so on Package included: 2 × Air stones notice (1)You need an air pump more than 4w to run this stone. (2)Soak the stone completely in water about 3 hours before use. (3)Clean regularly as they get clogged replace stones after it stops working properly.
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