Features: Made of high-grade material, which is non-toxic, safe, energy-saving and eco-friendly. Provides precise and clear carbon dioxide bubbles. Simple design, the best safety performance. Easy and convenient to use and install. Also come out with excellent dissolved rate and produces excellent effect for the aquarium. Specifications: Condition: Diffuser Material: Stainless Steel Atomizing Nozzle: Approx. 2cm / 0.8", 3.05cm / 1.2" (optional) CO2 Diffuser Length: Approx. 20cm / 7.9", 25cm / 9.8", 35cm / 13.8", 40cm / 15.7" (optional) Package Weight: Approx. 6g~205g Package Include: 1 x CO2 Diffuser Or 1 x Atomizing Nozzle Note: It is normal that large bubbles will appear on the thinner sheet at the beginning of use. After 24 hours of continuous use, the large bubbles will gradually decrease, and the large bubbles will disappear within 3 days at most. 1Made of high-grade material, which is non-toxic, safe, energy-saving and eco-friendly 2Provides precise and clear carbon dioxide bubbles 3Simple design, the best safety performance 4Easy and convenient to use and install 5Also come out with excellent dissolved rate and produces excellent effect for the aquarium Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.