SPECTRA AD MARKER, 6 PC SET - 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 is ideal for art and design. Color dry fast, are 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