These Brush Markers are alcohol-based, non-toxic permanent ink markers. They use the same professional quality dyes as the ProMarker which allows for a smooth, streak-free finish. Great to use on a wide range of other surfaces, including glass, acetate, plastic, metal, textiles and more! The translucent colors can be blended for an almost unlimited palette, while single colors can be layered for added depth and shade. Each marker has twin tips; the brush nib for fluid strokes and variable line width and the broad nib for large color fills. These markers can be used alongside the ProMarker. Certified non-toxic and conform to standard ASTM D-423. Brand: Winsor & Newton