This product is a co2 diffuser disc. It is made of solid materials. It is safe and durable. It can serve you for a long time without being easily . It is an excellent co2 diffuser disc that can bring you convenience, allowing you to have comfortable experience. Features - Color: White - Material: plastic, stone - Size: 3.10X3.10X0.50cm/1.22X1.22X0.20in - Ensure the health of your aquatic plants and improve their growth by supplying sufficient CO2. - A good substitute CO2 diffuser for your broken or worn out one. - Fine and high density diffuser disc, dissolve CO2 through fine air bubbles. - Small and compact size, light in weight, you can carry and use it wherever you go. - It is in stable characteristics, high performance and it is in great reliability, simple, easy to install. Package list: 1 x CO2 diffuser Slice