1Made of high-grade material, which is non-toxic, safe and eco-friendly 2Provides best carbon dioxide bubbles refinement effect 3Can increase the efficiency of CO2 dissolved in water, which helps to ensure plants receive proper amounts of CO2, improve the growth and health of your plants with sufficient CO2 supply 4Easy and simple in cleaning and replacing 5An indispensable item for your fish tank or aquarium, durable and reliable Description: This carbon dioxide diffuser slice is made of high-grade material, which is non-toxic, safe and eco-friendly. It provides best carbon dioxide bubbles refinement effect.Easy and simple in cleaning and replacing.So, what are you waiting for? Don't miss such a good chance. Features: 1. Made of high-grade material, which is non-toxic, safe and eco-friendly. 2. Provides best carbon dioxide bubbles refinement effect. 3. Can increase the efficiency of CO2 dissolved in water, which helps to ensure plants receive proper amounts of CO2, improve the growth and health of your plants with sufficient CO2 supply. 4. Easy and simple in cleaning and replacing. 5. An indispensable item for your fish tank or aquarium, durable and reliable. Specifications: Condition: 100% Brand new Item Type: Carbon Dioxide Diffuser Slice Material: Ceramic Color: As Pictures Show Optional Diameters: S (20mm / 0.79inch ), M (31mm / 1.2inch) Package Weight: approx. 12-30g Package Include: 5 x carbon dioxide diffuser slice Note: Please soak it in water for 24 hours before the first use, and then it will gradually release more fine bubbles within the first 48 hours.