Description: This item will dissolve Carbon Dioxide (CO2) speedily into your aquarium or tank Atomic pores on the ceramic disc breaks down Carbon Dioxide into tiny streams of bubbles Suitable for use as a decoration or provides a good source of aeration for the tank or aquarium CO2 Diffuser Size(L x W ): Approx. 3.54 x 1.46 inch / 9 x 3.7cm Glass Cup Diameter: Approx. 1.1inch / 2.8cm Material: Glass and Ceramic disc Color: Clear Package Includes: 1 x CO2 Diffuser with Ceramic Disc 2 x Suckers