Expo Green Low-Odor Chisel Tip Dry Erase Marker Package of 12, contains specially formulated low-odor, dry-erase ink. They are perfect for classrooms, small offices and homes. They can be used on most whiteboards, glass and non-porous surfaces. Dry-erase markers with chisel point deliver consistent color quality for bold colors and great erasability. They are certified AP non-toxic and conform to ASTM D-4236.