Molotow® ONE4ALL™ Pump markers use an acrylic-based hybrid ink/paint. All colors are highly-opaque, permanent, have good UV resistance, and work on most surfaces indoors and out. The pump action activates the patented capillary system and FLOWMASTER™ valve, which ensures consistent ink flow without starving or over saturating the nib. Nibs are exchangeable and replaceable and the marker is refillable at a minimum of 50 times. Marker ink uses artist quality pigments that are non-toxic and are quick drying. For increased transparency, marker ink may be diluted with water or acetone (1-3%). Cross over nibs are available in the 1.5mm size and feature a hard plastic point for fine line rendering. Shake marker well before use. To activate, position marker nib down on a clean surface and pump the marker until you see ink flow into the nib. Empty markers and ink refills are available to mix custom colors. Made in Germany. Conforms to ASTM D 4236. Non-toxic.