Sharpies, and that is their brand name, are permanent markers that come in a wide variety of colors, sizes and styles. I'm not a salesmen, but definitely a user! I don't know what we did before them and I never leave home without one. I think my tool kit has about a dozen, my desk at home has a 15 different. Picked up at any good office supply store (in the states, at least.) http://store.officeworld.com/search.asp?ShellID=137|39|219|36|43|73|81|127|54|236|131|249|209|182|92|97|6|15|200|60|173|81|104|95|200|22|70|165|56|63|48|56|110|8|211|196|221|168&HiddenShoppingLists=&HiddenCustomerLists=&keyword=sharpie&SearchCommand=Search&CP=agob:sanford.sharpies&cpid=