The perfect tool for the occasional user of a protractor. Printed on durable tracing paper it can do all the things a protractor can and more. It can be stapled to homework sheets; it can be folded in half. It's not a disaster if it's lost as they are so reasonably priced, providing another is not an issue. In other words, the perfect tool to have in your drawer for working with angles. In pads of 50.