Koi water brush puts a water reservoir at your fingertip! Built-in Water Tank Inside the Handle to Distribute Water Easily and Directly to the Brush Tip. Fine, flexible nylon fibres produce fine lines or bold strokes. The Transparent barrel indicates water level. Polypropylene Transparent Barrel and Nib Holder Section. Can be Used with Any Water Based Colors, Unique Water Reservoir Comfortable Grip for Controlled Blending, Shading and Highlighting. Contains one brush 4ml water tank