DescriptionDesigned for fish tank or aquarium, this diffuser disc can dissolve CO2 into your tank. Made of premium material for long time and durable use. It has a simple design, but very practical in use, giving you a good using experience. Also can be a good gift choice for your friends, they will like it.Features- Color: White- Material: plastic, stone - Size: 3.10X3.10X0.50cm/ 1.22X1.22X0.20in- Replace your old or broken CO2 diffuser with a new one. - Release enough quantity CO2 into the water, allowing the aquatic plant to grow properly. - It may release large air bubbles, it will release smaller air bubbles after it is saturated with water. - Exquisite workmanship, reasonable structure, professional and practical, can bring you convenience. - It is simple in design, but very practical in use, which brings great convenience to you.