Double-ended design: brush diameters of 1.5cm for the small end, 3cm for the large end, Flexible Aquarium Cleaning Brush ideal for all aquariums, aquariums, pet fountains and home cooking home. Durable stainless steel spring: The Double-end Pipe Brush not easy to break and rust, and the brush is firmly connected with the spring, no worry about falling off. Remove algae and dirt that accumulates in pipes and tubes. Easy to use: the Double-ended Pipe Brush is flexible and long, comes with two brushes of different sizes, which makes the pipe cleaner suitable for kinds of tube diameter. Wide Application: Double-ended Pipe Brush perfect for cleaning the inside of assorted pipes, especially useful for bent pipes, like U-shaped tubes .Perfect tool for cleaning long pipes.