Whether you stick them on the wall or on a desk, these poster size, reusable drawing surfaces are a great new environmentally-friendly medium for creativity. These poster-sized dry erase sheets really do stick and re-stick to almost any surface - over and over again. Our testers loved that they could put them up without putting holes in the walls, so they could stick them places they wouldn't ordinarily be able to put a message board. They work well with either the dry-erase crayons provided or with any dry-erase marker and erase easily. Great for list-making and other organizational tasks, but the larger size is especially suited to drawing pictures. CAUTION: While the larger size gives kids more room to draw, you'll still want to caution preschoolers not mark too close to the edge and be careful not to smudge the colour onto walls when erasing.