5-pack Mini Aquarium Air Stones For Ponds & Hydroponics Oxygen System. Introducing the Mini Round Mineral Bubble Air Stone Set – the Perfect Solution for Enhancing Oxygen Levels in Your Aquariums and Ponds. Crafted from Durable Materials and Processed at High Temperatures, These Air Stones Provide Excellent Gas Diffusion and Ozone Resistance, Making Them Ideal for Fish Tanks. They Help in Balancing PH Levels, Reducing CO2, and Improving Water Circulation. Designed for Reuse, They Are Easy to Clean and Connect Seamlessly to an Air Pump (not Included), Creating an Engaging Bubble Effect Essential for Oxygenation. Features: - Durable Construction for Long-lasting Use - Superior Gas Diffusion and Ozone Resistance - Enhances Oxygen Levels and Water Circulation - Reusable and Easy to Clean - Compatible with 4mm Inner Diameter Air Tubing - Includes 5 Air Stones (tubing Not Included) - Dimensions: 2cm Diameter; Weight: 9g Each - Easy Setup: Soak for 15 Minutes Before Use Elevate Your Aquatic Environment with These Efficient and Reliable Air Stones .