Product Dimensions:2 x 2 x 2 cm; 100 Grams Size:16mm Quantity:1 batteries required:No Item Weight:100 g welcome to my store , Hope you have a pleasant shopping trip! Features: 1.High-quality PP material, corrosion-resistant, does not affect water quality2.Soaking-free design, nano-scale thin sheet, high dissolution rate, special acrylic replaceable module3.Simple installation and use, not occupy the internal space of the fish tank and grass tank, not affect the flow of waterSpecificationssize : 12mm (for 12/16 water pipes) 16mm (for 16/22 water pipes)material:PP Package List:1X CO2 Diffuse Atomizer Notes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement. High-quality PP Material, Corrosion-resistant, Does Not Affect Water Quality 2 Size Can Be Choose : 12mm (for 12/16 Water Pipes) 16mm (for 16/22 Water Pipes) Soaking-free Design, Nano-scale Thin Sheet, High Dissolution Rate, Special Acrylic Replaceable Module Simple Installation and Use, Not Occupy the Internal Space of the Fish Tank and Grass Tank, Not Affect the Flow of Water, and the Air Outlet Is Close to the Water Flow SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied. See more product details High-quality PP Material, Corrosion-resistant, Does Not Affect Water Quality 2 Size Can Be Choose : 12mm (for 12/16 Water Pipes) 16mm (for 16/22 Water Pipes) Soaking-free Design, Nano-scale Thin Sheet, High Dissolution Rate, Special Acrylic Replaceable Module Simple Installation and Use, Not Occupy the Internal Space of the Fish Tank and Grass Tank, Not Affect the Flow of Water, and the Air Outlet Is Close to the Water Flow SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied.