Koi Water Brush, with the smaller handle reservoir (4ML) with the SMALL nib (#2 round) brush head. The portable and collapsible Koi Water brushes are the unique tool that puts a water reservoir at your fingertips. The self contained water reservoir inside the handle delivers water conveniently and directly to the brush tip. The fine flexible nylon tip provides excellent watercolor dilution and can produce fine lines or bold broad strokes. The lightweight transparent barrel signals when refilling is needed. 4-7/8" overall brush length. For ages 8+ years. Contains small parts - keep away from small children. Available in three round brush sizes: Small (#2 round), Medium (#6 round) and Large (#8 round) Packaged individually in re-sealable, hanging pouches.