Letraset Pro Marker Blending Set 1, Twin-Tip, 12-Pack ProMarkers are the ideal marker for crafting, design and illustration, rubber stamping, and so much more These markers allow you to easily overlay and blend colors to create shade and tone; twin tips offer a fine bullet tip for details and a wider tip for large areas Alcohol based, quick drying, and non-toxic This package contains 12 markers, blending pen, blending chart, and convenient carrying case Conforms to ASTM D4236