Derwent Waterbrush Assortment: use with your Inktense pencils and blocks. These professional grade brushes are refillable, portable, leak proof and easy to clean. Fine, medium and chisel tip heads are easily distinguished by number so you can grab the one you need to paint with. A handy water holder and brush in one: paint outdoors with no water pot, no spills! This package contains three (3) Derwent waterbrushes: a fine tip, medium tip and chisel tip offering you control and quality results.