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【Premium Materials】These pond air stones are made of premium silicon carbide, they are non-toxic, odourless, hard and wear-resistant, not easily washed away by water currents or clogged, they deliver a long service life. 【Powerful Airflow】Thanks to its high-density microporous structure, these air stones for fish tanks produce a strong, even air flow, creating a fresh and comfortable breathing environment for your fish. 【Standardised Design】The bubble diffuser is compatible with standard air tubes with an inner diameter of 4 mm or 8 mm. Please soak it in water for at least 2 hours prior to use. 【Quiet Operation】This air stone produces minimal noise whilst releasing air, making it ideal for homes, offices and all other spaces requiring a quiet environment. 【Large Size】This aquarium air stone measures 22 cm in length and 5 cm in diameter. It is suitable for numerous uses, including hydroponic systems, ponds and aquariums.