Feature: 1. HIGH DENSITY: Air disk atomization bubble adopts high density refinement of oxygen output, super micro nano, uniform air output. 2. HIGH DISSOLVED OXYGEN: Fish tank nano air disk ensures the oxygen level in the fish tank to ensure the fish have enough oxygen to breathe. 3. ENVIRONMENTALLY FRIENDLY: Aquarium nano air disk is made of high temperature sintered green material, which will not affect the environment of the fish tank. 4. EASY TO CLEAN: Fish tank atomizing bubble disk is strong and rustproof, easy to clean and can be used many times for a long time. 5. FISH TANK ACCESSORIES: Aquarium atomizing bubble disk is compact but well constructed, ideal for fish tanks and small ponds. Specification: Item Type: Fish Tank Nano Air Disk Material: Plastic Applicable Fish Tank Size: 180-300cm / 70.9-118.1in Size: Approx. 20cm / 7.9in. Package List: 1 x Atomizing Bubble Disk1 x Non Return Valve1 x Suction Cup1 x Adjustment Valve Note: Please allow some error due to manual measurement.