Spectra AD Markers are extremely versatile, featuring a dual-ended tip with a flexible brush tip on one side and the innovative Tri-nib on the other. The AD Marker signature Tri-nib offers three line widths - fine, medium and broad - with just a twist of the wrist. The colors are blendable when wet and dries fast and permanent for superior layering. Details:Includes assorted warm gray colors12 markersDouble endedColor-coded barrel and capXylene-basedNontoxic