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.