Feature:1. The nanoparticle is made of mineral sand, adhesives and MDG process. After 15 days of high and low temperature baking, the nanoparticle refining effect is ensured.2. Made of high quality acrylic material, beautiful appearance, convenient and practical.3. The product works mute and dissolved oxygen is high.4. Exquisite workmanship, sturdy and durable, practical CO2 refiner, adding beauty to your fish tank.5. Highly transparent acrylic material, greatly fitting the environment in the tank, suitable for fish tank about 60‑180cm/23.6‑70.9in.Specification:Item Type: CO2 RefinerMaterial: Acrylic Color: As Pictures Shown Air Disk Diameter: Approx. 60mm/2.4in, Air Pipe Diameter: Approx. 4mm/0.2inWeight: Approx. 84g/3ozUses: Air Refiner, Fish Tank Increased Oxygen Air StoneSuitable for Fish Tank: Approx. 60‑180cm/23.6‑70.9in. Package List:1 xRefiner 2 x Suction Cup1 x Air Pressure Regulator