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Features:High-temperature sintering, the stone is sturdy and durable, and the dissolved oxygen rate is high, producing uniform and tiny bubbles instead of a limited number of large bubbles.Increase oxygen and reduce carbon dioxide levels. Durable and washable. Sturdy and non-toxic materials are safe for your fish.Soak the stone completely in water about 1 hour before use.After using for weeks or months, use a brush to clean it regularly.Specification:Dimension: approx. 4.5" x 0.8" x 0.5"/11.5 x 2 x 1.2cm (L*W*H)Color: Green and blue Material: mineral and plastic Package include: 6 x air stones for aquariums