This is a set of two dual-hair brushes that have received positive feedback for their ease of use. They also come with a hanging string, making them easy to dry. Bristle length x diameter: Large...4.2 x 1cm Medium...3.7 x 0.9cm I also mainly sell calligraphy supplies, so I would appreciate it if you could follow my page and take a look. Calligraphy/Shodo supplies...Brushes