Pentel Set of 3 Water-Tank Brush The brushes with water tank are perfect for watercolour or watery materials. They also work perfectly with distress scrapbooking inks. Nylon bristle brush. Ideal for use with watercolours, pencils, crayons and waterproof markers. Clean, easy to use and does not drip. Ideal for watercolorists, illustrators, drawers, graphic designers ... and for work with degraded or washed effects. This brush contains a water tank that makes it very comfortable to work with. When you squeeze the tank the water reaches the bristles, making it unnecessary to carry a water container. Three sizes: fine, medium and thick tip. Brand: Pentel