LETRASET-ProMarker 6-Marker Set. Ideal for crafting; design; illustration; rubber stamping and so much more; ProMarker allows you to easily overlay and blend colors to create shade and tone. Twin tips offer a fine bullet tip for details and a wider chisel tip for large areas. ProMarker sets provide essential basic color selections in coordinated groupings. Alcohol based; quick drying and non-toxic. This package contains six markers. Available in a variety of color sets (each set sold separately). Conforms to ASTM D4236. Imported.