KleenSlate large dry erase markers with integrated eraser are created by a teacher and proven in the classroom. Our ink is specially formulated to be low odor and non toxic. They are designed for use with whiteboards, glass, mirrors, metal, ceramic tiles and most non-porous surfaces. KleenSlate, with its award-winning customizable whiteboard, gives you a marker that provides consistent writing quality and that all-in-one experience. Even more, our dry erase markers have a 48 hr CAP-OFF ink technology. Markers conform to CPSIA, ASTM D-4326 and EN71 standards. We also put a tracking number on every marker; we know when every batch of ink was manufactured and put into the barrel. KleenSlate durable, reliable dry erase markers are here to give you a helping hand. Whether you are going over a class lesson, checking for answers or facilitating a small group, these markers ensure everything is clear and easy to read. Marks wipe away cleanly with KleenSlate Microfiber cleaning cloth or the built-in eraser, for those small mistakes. Our set of dry erase markers is sized perfectly for a comfortable, natural hand grip. You can draw or brainstorm for long periods of time because our points don't push in and they are low odor. Perfect tool for home, school, hospital, office, wherever a dry erase marker is needed. For best results, store these markers horizontally. Flip and tip the markers overnight to reconcentrate the tip. If they are writing light, next morning they are good to go.