DescriptionThis item is carbon dioxide refiner for fish tank. The bubbles are fine and uniform. Glass material, practical and safe. With high-transmittance glass, compact and beautiful. The refiner is placed at the bottom of the aquarium to the dissolution effect. Does not occupy space, greatly improve the dissolution rate of CO2, and the diffusion efficiency is high.Features-Color: White.-Material: Glass. -Size: About 8.00X6.00X4.00cm/ 3.14X2.36X1.57in. - This CO2 diffuser is perfect for hydroponics enthusiasts and fish and shrimp breeders. -High transparent glass, acid and alkali resistance, corrosion resistance. -Decomposition into small and fine bubbles, even air outlet, using without blocking, even water flow. -Exquisite craft, smooth and bright surface to provide a beautiful appearance for fish tank. -Efficient and practical, fast and convenient, easy to use, provide a chic appearance for grass cylinder.