These beautiful pencils by Faber Castell offer high quality pigments that are bright lightfast and acid free. The colors are fully water soluble- simply draw on any surface that is suitable for watercolor and then blend colors with a wet brush. The leads are bonded down the complete length of the pencil which prevents breakage. This also ensures that the color leads will not slip out of the wood casing during use. Colors layer beautifully and can be used with or without water.