Feature: 1. UNIFORM AIR OUTPUT: Atomizing aquarium bubble disk with high density and fine oxygen output, super micro nano, uniform air output. 2. HIGH DISSOLVED OXYGEN: Fish tank nano air disc is high dissolved oxygen, ensure the oxygen content in the fish tank, ensure the fish have enough oxygen to breathe. 3. EASY TO CLEAN: Aquarium nano bubble disc is easy to clean and can be used many times for a long time. Regular cleaning can avoid clogging. 4. SAFE MATERIAL: Aquarium nano air disc is made by high temperature sintering of safe material, which will not cause any impact on the environment of the fish tank. 5. SPACE SAVING: Fish tank nano bubble disc is compact and does not take up too much space, making it suitable for most aquariums and fish tanks. Specification: Item Type: Aquarium Nano Air Disc Material: Plastic Applicable Fish Tank Size: Approx. 50-120cm / 19.7-47.2in. Package List: 1 x Aquarium Nano Air Disc1 x Check Valve1 x Suction Cup1 x Control Valve Note: Please allow some error due to manual measurement.