These markers have a perfect gradation of three colors, numbered from light to dark. For a smooth, controllable blend with beautiful shade youll return to time and again. Now anyone can color and blend like an expert. Its easy! This 4.25x8x.75 inch package contains six Triblend markers in assorted colors. Conforms to ASTM D 4236. Comes in a variety of colors. Each sold separately. Imported.