Math accessories set : pencil, eraser, protractor, triangle rulers, straight ruler, compass set including the plastic box. Specially designed self centering compass, for ease and accuracy while drawing circles and angles. Both divider and compass are made with non-rusting strong material to last long and remain in shape and shine. Portable and durable mathematical geometry tools are constructed of plastic material, lightweight, easy and handy to be put into your school bags or in your desk.