Product description material: plastic 1.Improve CO2 Dissolution: Double seal ring improves CO2 dissolution efficiency. 2. The suction cup makes the bubble stone firmly adhere to the water tank, not easy to slip. 3.Applicable For: Suitable for families, office fish tanks, ponds, aquariums. 4.Replaceable Disc Oxygen Bubbler: The material is sturdy and durable. It can be used for a long time and has better dissolved oxygen effect. When the bubble burst into the water, the sound is super quiet. 5.Produce Bubbles: A large number of thin bubbles are generated in the fish tank and dazzle. 1. Due to different monitors and lighting effects, the actual color may be slightly different from the image 2. Due to manual measurement, please allow 1-3cm deviation Size: length 53mm diameter 14mm (suitable for leather tube 4mm, 5mm, 6mm) Color: black Quantity shipped: 10