Chartpak Spectra AD Marker, Tri-Nib and Brush Dual-Tip, 6 Assorted Basic Color Set in Plastic Case, 1 Each (SBASIC6AD) Dual tip marker - tri-nib for fine, medium and broad lines on one end and flexible Brush nib on the other end Low odor, alcohol-based marker set, available in 6 brilliant colors, is ideal for art and design Color dries fast, is Permanent and non-toxic Comfortable, ergonomically-shaped barrel does not roll away on any surface Use with spectra ad blender marker to create gradations, to blend and to lighten color