Winsor & Newton Promarkers are alcohol-based, non-toxic permanent ink markers. The professional quality dyes used provide for a smooth, streak-free finish and can be applied liberally to paper without damaging the surface. Great to use on a wide range of other surfaces, including glass, acetate, plastic, metal, textiles and more! The translucent colours can be blended for an almost unlimited palette, while single colours can be layered for added depth and shade. Each marker has twin tips; the fine bullet nib for precision detailing and the broad chisel nib for shading larger areas. Certified non-toxic and conform to standard ASTM D-423.