Justman Brush online brush catalog features over 100 Test Tube, Bottle and Flask Brushes. Each Test Tube, Bottle and Flask Brush is engineered to perform a variety of cleaning functions. As bottles and tubes come in many shapes and sizes, so do our brushes. We offer twisted in wire Test Tube, Bottle and Flask brushes in six basic brush tip configurations: Blunt or Round Tip Brushes are manufactured by Justman Brush with a smooth tip or round wire end. This design ensures there are no sharp wire edges to scratch the item being cleaned. Brushes with this type of tip are manufactured without a loop or ring handle. These brushes are used in food service, industrial, and medical applications. Justman Brush has Blunt Tip expertise. Contact us for more information. Fan Tip Brushes and Sponge Tip Brushes are designed to enter narrow mouth bottles and tubes, and then expand to clean the sides of the Bottle, Flask & Tube, while protecting the bottom of the bottle or tube from scratches from a wire tip.