REEVES-Letraset ProMarker Twin Tip. Use this dual ended marker for a variety of projects! Each pen is double-ended, one end is a broad chisel tip that is great for filling large areas and the fine bullet tip end is for more detailed work. ProMarkers have alcohol based inks. This package contains one twin tip marker. Available in a variety of colors, each sold separately. Conforms to ASTM D 4236. Imported.