It is made of stainless steel spring and can be bent freely without deformation. There are multiple caliber options for cleaning the wool. The size and head design is suitable for cleaning 9-35mm such as three-pipe, four-pipe, six-pipe, eight-pipe, one-inch water pipe and other pipes and glass pipes of different diameters._x000D__x000D_Feature_x000D__x000D_- Color: As shown._x000D_- Material: Stainless steel._x000D_- Size: Spring length 155cm filament diameter; 18/30mm._x000D_Type: Brush_x000D_Brush material: nylon_x000D_Shape: round_x000D_Function: Cleaning_x000D_Type: fish tank_x000D_Handle material: 304 stainless steel_x000D_Bristle length: 55 (mm)_x000D_Brush use: cleaning water pipe_x000D_- Designed with rotating bristles and stainless steel, the flexible double-head long brush can be reused many times for easy push-pull and pull._x000D_- Suitable for home and aquariums, our double-ended hose brushes are flexible and suitable for use inside water pipes, especially U-tubes._x000D_- Use a mild detergent and warm water, keep the tube as straight as possible, gently handle the brush in a short stroke, and gradually work further in the tube. Avoid using large amounts of cleaning._x000D_- Two sizes of brush design, you can choose the best terminal according to your needs._x000D_- Warm Tip: Dear buyer, due to lighting effect, monitor& 39;s brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you Packing list:2 x Brush