High quality artists' grade pencils in the traditional colours, featuring various compositions of materials to produce a wide variety of artistic effects. The wax (or fat) free quality are easy to wipe and can often be extended by painting with water. This quality only adheres lightly to the paper and should always be 'fixed' with fixative spray. The waxed grades (containing fat) feature stronger adhesion to the paper due to the wax or oil based binding agent. In use they are harder to wipe but it is not essential to 'fix' the work with fixative spray.