DescriptionAn airstone, whose purpose is to gradually diffuse air into the tank and provide oxygen for fish to breathe, is an necessity to have around your house if your are a lover of aquatic animals. Our air stones are made of mineral material.Feature- Color: As shown.- Material: Stone.- Size: About 2x2x3.5cm.- Made og materials, durable and safe.-With high temperature sintering, the stones are sturdy and durable, have high dissolved oxygen rate and create even and tiny bubbles rather than a limited number of large ones.- An airstone, whose purpose is to gradually diffuse air into the tank and provide oxygen for fish to breathe, is an necessity to have around your house if your are a lover of aquatic animals.- Our air stones are made of and safe mineral stone material.- Suitable for aquariums and fish tank. It can offer fish fresh air.