These whiteboard markers feature advanced formula ink that is fast-drying, odorless and intense. With their Dry-Safe ink, markers can be left uncapped for several days without drying up. When left open during breaks in writing, they remain ready for action without delay. Marker marks dry wipe from whiteboards and surfaces such as glass and porcelain without leaving a trace. Their chisel tips remain locked in place and cannot be pushed back into barrels even under extremely heavy writing pressure. Design features polypropylene barrels and caps. Set includes black, blue, red, and green markers with desk-stand box.