iduoduo 6.7-inch Micro Bubble Air Stone Strip are made of high quality non-toxic mineral material. With 1500° 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 air stone, whose purpose is to gradually diffuse air into the tank and provide oxygen for fish to breathe, is a necessity to have around your house if you are a lover of aquatic animals.Feature: ·Uniform outlet, not float no blockage, the water curtain effect of micro bubbles are quite mesmerizing to watch·dissolve more oxygen for your fish to breathe·Safe, Washable& Non-toxic material·low voltage drive, effect of micro pressure atomizationRange of use: Office, fish tank, pond, hydroponic environment. Anywhere you need oxygen and filtration! Freshwater and saltwater can do!After-sales Warranty:If you have any questions, please feel free to contact us.