Features: 1. Six sizes for your option: Diameter 4cm(1.57in),6cm(2.36in),8cm(3.15in),10cm(3.93in), 12cm(4.72in),15cm(5.90in) for your options,fit for different size of tank. well-constructed for continual bubbling. Ideal for fish tanks, aquariums and small ponds. 2. Bubble diffuser: The air stone discs produce a good amount of dense bubbles. A great way to increase oxygen solubility in your aquarium and enliven the aquatic lives. 3. Disk-shaped design: makes it easily be hidden in your aquarium or other fish tank bubble decorations 4. Reliable Material: Made of mineral material and sintered at a high temperature, it causes no effect to the health of your aquatics. Keep fish or roots growing healthily. 5. Easy to Use: Soak the stone completely in water for 1 hour before use. Clean it regularly with a brush as it gets clogged after weeks or months of usage. Specifications: 1. Size: 4cm(1.57in),6cm(2.36in),8cm(3.15in),10cm(3.93in),12cm(4.72in),15cm(5.90in) 2. Color: Grey
