Educational Colours Whiteboard Markers are especially made for children! These dry-erase markers are made with non-toxic, waterbased ink (there is no alcohol in this product). They feature strong, bold colours, making them easy to read on the board. Markers have a thick bullet nib measuring 4.4mm, ideal for use on whiteboards in the office or classroom. This set of 4 includes 1 blue, red, green and black and comes packaged in a plastic storage wallet.