Features: 1. Produces Dense Bubbles Quietly: This aquarium air bubble stone which can create a very dense cloud of small bubbles quietly. when the bubbles burst into the water, the sound is quieter. Create lots of thin bubbles in fish tank, make dazzling curtain effect. 2. Double Oxygen Dissolving Rate: Great to add oxygen to your hydroponics growing system, Increase oxygen levels, lower CO2 and raise PH. 3. Easy to Use: 2 suction cups makes the air stone adsorbed on the tank firmly. Durable, great for home and office fish tank, aquarium, and hydroponics nutrient tanks. 4. Sate: Made of high quality plastic, non toxic, eco-friendly, safe to your fish tank and aquiarum. 5. Packge Include: This fantastic aquarium stone kit includes 1 nano air disc stone, 2 suction cups. suitable for 3 to 15 Gal aquarium and 1.5-3W air pump. Package Includes: 1 Piece Aquarium Air Stone with 2 Suckers Specifications: Material: Acrylic Color: White Size: Y60-Approx.6x6x7cm/2.36x2.36x2.76in, Y35-Approx.3.5x3.5x7cm/1.38x1.38x2.76in Weight: Y60-Approx.90g, Y35-Approx.50g note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!