Molotow One4All markers are engineered and manufactured in Germany. Their high-quality, acrylic-based ink is permanent, UV resistant, quick-drying and non-toxic. It can be diluted with water or acetone, and will dry to an opaque, semi-gloss finish on nearly any porous or non-porous surface. They feature a patented capillary system and a Flowmaster valve, which offers a consistent paint flow to the tip of the marker. Suitable for both indoor and outdoor use. Includes two 1 mm brush tips for the following markers: Aqua Twin, Empty Twin, Blender Pro. The Molotow One4All range is adaptable and environmentally friendly, as all markers are reusable and both the markers and the spray paints use the smallest amount of solvents possible, relying on an acrylic paint which is 85% water. The packaging is environmentally friendly and the manufacturer has a social responsibility program.