Letraset Skin Tone 1 FlexMarker, Set of 6 Letterset Flex Marker, a high quality, twin-tipped maker Flex Marker is uses same alcohol-based dye inks as, making them perfect for all kinds of arts and crafts Flex Marker features a broad chiseled nib on one end for large color fills and a brush nib for fluid strokes and variable line widths on the other