Retractable dry-erase marker features a unique safety seal valve that prevents dry-out. The cap-free design makes the marker easy to open and close with one hand. Bold and vibrant colors are visible from a distance. Low-odor ink is ideal for classrooms and conference rooms. Expo markers erase cleanly and easily on most whiteboards and nonporous surfaces. Certified AP nontoxic ink conforms to ASTM D4263. Assorted colors include black, red, blue, purple, green and orange.