YOUR TAX-DEDUCTIBLE CONTRIBUTION PURCHASES THIS ITEM FOR OCS - THANK YOU! Bold markings are perfect for the office and in the classroom. Erases easily for quick, clear clean-ups. Use on erasable marker boards, glass and other nonporous surfaces. AP Certified nontoxic. Global Product Type: Markers-Dry Erase; Marker Type: Dry Erase; Color(s): Black.