Pack of 4 Sharpie whiteboard markers in red blue black & green. These markers are for use on whiteboards glass & on-porous surfaces. Low odour in & quick drying easy erasable ink. Brief History of Sharpie The popularity of Sharpie markers continues to soar in the 1990's due in part to the $5 billion memorabilia industry. Autograph seekers & celebrities alike use Sharpie markers on everything from posters & trading cards to balls & jerseys. By the end of 2002 over 200 million Sharpie markers have been produced enough for Approx. two Sharpie markers for every household in America! Sharpie gains added notoriety with its successful advertising & marketing campaigns.