LETRASET-ProMarker Permanent Twin Tip Marker. Ideal for crafting; design and illustration; rubber stamping and so much more; Promarker allows you to easily overly 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; dye-color; quick drying and non- toxic. This package contains one permanent twin-tip marker. Available in a variety of colors: each sold separately. Conforms to ASTM D4236.