Pentel Aquash Water Brush - Large - This versatile nylon-tipped brush pen from Pentel allows you to fill the barrel with any water-soluble medium (water-soluble inks watercolours or gouache) to use for lettering or painting.Alternatively you can just use plain water and pick up watercolour or gouache colour from your palette to create great wash effects. You can control the density of colour by squeezing on the barrel of the Pentel brush pen to make the brush wetter or drier.It's also an ideal companion for the Derwent Watercolour artist. Using a water filled barrel you can create imaginative blends and washes with your pencils.Pentel Aquash water brush comes in three nib sizes: fine medium and broad.NB: Before first use wash in warm water.