Signature Dry Erase Marker. If you need color to add some excitement and impact to your announcement, this marker is the best choice. Expo markers produce vibrant, uninterrupted smooth lines, lasting color and erase easily with a dry cloth or Expo eraser. Solid, no-pungent wick Can be used on enameled boards, melamine, glass and most dry erase surfaces. Vibrant colors and excellent erasability. Can be used on whiteboards, glass and other non-porous surfaces. Chisel tip allows for versatile writing in bold or fine lines. AP mark (USA safety standard) non-toxic. Vibrant colors and excellent erasability. Can be used on whiteboards, glass and other non-porous surfaces. Set of 4 colors are black, red, blue and green. Just for your reference. Set of 8 colors are black, red, blue, green, pink, orange, brown and purple. Ink is AP certified non-toxic and conforms to ASTM D-4236.