Feature - Made of aluminum alloy which is durable, scratch resistant and has a long service life. With knurling design, it has good anti-slip performance and won't harm your aquarium fish and shrimp. It has good anti-corrosion and anti-rust function due to nickel-plated and polishing surface. Effect - Aquarium CO2 diffuser can greatly improve CO2 solubility, high efficiency of diffusion of carbon dioxide. Provide a healthy environment for your fish and improve the growth and health of your plants with sufficient CO2 supply. Special design - High-density refined tablets make the bubbles more delicate and it is not not easy to block the diffuser. After exhausting the refined carbon dioxide tablets, you can easily open the CO2 diffuser and replace it. Exterior - Small size and beautiful appearance. With suspended adsorption design, it will not occupy the bottom area of the fish tank. Looks beautiful and uses space efficiently. Specifications - Package includes: CO2 diffuser, suction cup, 20mm refined carbon dioxide tablets. Material: aluminum alloy. Silver color. Size: 60*24mm.