yueton Flexible Double Ended Black and White Nylon Long Brush, Hoses Bent Pipe Cleaning Brush, Aquarium Water Filter Pipe Air Tube Brush Double ended long brush, flexible and bendable Bristle diameters: 2.5cm for black end, 2cm for white end Overall length: approx 70cm Nylon brush and metal wire Perfect for cleaning the interior of assorted hoses, especially useful for bent pipes, like U-shape tube