Letraset Pro Marker Rubber Stamping Set 1, Twin-Tip, 10-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 Includes 10 markers and a fine line pen for sketching and outline Conforms to ASTM D4236