Aluminum alloy material, solid materials, no rust. Unique design, elegant and concise.Make the CO2 bubbles even more uniform and more detailed. Nut-free, good safety performance.Stable shape, will not deform easily due to pressure change or impact of external forces. Suitable for mini cylinders. Every one can install it easily without instruction. Strong and solid structure can assure a long time service. Safe and beautiful,improve growth and health for your plants with sufficient CO2 supply. Product Description: Features: 1.CO2 diffuser breaks down carbon dioxide gas into tiny streams of bubbles, also comes out with excellent dissolved rate and produces excellent effect for the aquarium. 2.CO2 diffuser made of aluminum alloy, which is rust-proof; Unique design, save space.The surface of the aluminum alloy is oxidized. Specification: Product name: Aluminum alloy refiner Product length: 6cm Product diameter: 23mm Product material: Aluminum alloy Package Included: 1 x Aluminum alloy refiner