brand new and high quality Features: Bubble stone Commonly known as diffuses stone (Sha Tau), a durable, good aeration, filtration, and widely used:A sewage treatment plant for aeration and Stirring to prevent large particles of sediment deposition, and removal of some organic matter. Aquarium (fish farms) strophic water body increase oxygen into the environment, bio-farming increase oxygen Live fish and seafood transport increase oxygen. Aquarium (purifiers) purification, filtration and water quality ozone sterilization and aeration. Other required air diffusion process uses. Artificial Plant only,other accessories demo in the picture is not included! Specification: Suitable for: Fish for Tank, Aquarium Suitable for inner diameter 4mm soft tube. Material: Plastic Dimensions(approx.):4cmx1.2cm/1.57''x0.47'' Color: Random delivery (If you buy more than one,the color you received may be the same color or different colors) Quantity: 1 Pc Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Air Stone (no retail package)