Features: Aquarium Air Pump Accessories: The air tubing adopt fine PVC material & standard connectors that can perfect provide oxygen increasing, improve water quality and oxygen rate underwater, good for fish, shrimp, create healthy aquarium environment. Standard Connector: The aquariums oxygen tubing with standard outlets 4/6mm(0.15/0.23inch), provide tight seal between airline hose and various air pumps, bubblers, aquarium filter, which can meet your various size fishtanks & household aquariums. Selected Material: The air tubing use qualified flexible PVC material, no-odor smell, nontoxic, tear & wear resistant, bring effectively oxygen increase for your aquarium, fishtanks. Natural Oxygen Circulations: The aquarium airline tubing can work with salt water or freshwater, good flexibility, distortion resistance, high tear strength, convenient to use and install. Wide Application: The aquarium oxygen airline tubing with wide application which can be use in aquariums, fishtanks, pond, garden, hydroponics system, terrariums, and various circumstance. Specifications: Product Dimension: approx. Inner diameter 4mm/0.15inch, outer diameter 6mm/0.23inch， total length 70 meters/229 ft Material: PVC Package Includes: 1 Roll Aquarium Air Tubing note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.