100% brand new and high quality Features: Specially designed for fish tank,which offers refined CO2 for aquatic organism,good for them growing,like plants. Adopts refined ceramic materials,will bring much higher CO2 diffusion efficiency,mini size and space saving,durable and high quality. Apply to air tube which caliber is 4x6mm,please confirm it whether fits you or not before order. Soaking it for 2h before use,will be much better atomizing effect. Easy to assemble and disassemble,excellent supplies for your fish tank. Specification: Material: Plastic,Ceramic Type: Aquarium CO2 Atomizer Color: As pictures shown Size: One Size Length: 3cm(1.18in) Quantity: 1 Pc(other accessories demo in the picture are not included ) Note:1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes(without retail package): 1 x Atomizer