Ticonderoga Redi-Mark + No Odor Chisel Tip Marker features a specially formulated, non-toxic, water-based ink that writes on virtually any surface and does not bleed through paper. Marker ink is permanent, odorless, waterproof and smear proof. Marker delivers smooth-flow, squeak-free lines in vibrant colors. 4 markers per set in black, red, blue and green.