Koi water brush is designed for the easy transportation and storage of water when you"re away from home or the studio. The brush separates into two parts a fine, flexible brush tip and a barrel handle with a plug to carry the water. The comfortable grip is great for controlled blending, shading and highlighting. Technical qualities are polypropylene, transparent barrel and nib holder section, nylon fibers for brush tip, large barrel 6inch overall brush length, by screwing barrel apart, the small brush collapses to 41 4inch, for ages 8 years and cap and plug please keep away from small children. 8 rounds brush. Available in large size. Comes in 4ml barrel tank.