5 Pieces math set: 5 in 1 geometry tool contains a Compassa , a 4 inch protractor,a 6 inch protractor, 2 pcs triangle ruler (45 and 60 degree) Drawing Compass with 2 mm pencil lead, used for drawing circle or circular.Made from Stainless Steel, durable and easy carry. Transparent plastic protractor and measurement ruler: transparent ruler and clear color makes you measure easier.; straight and triangle rulers with inch and metric scales on them, Portable and durable: geometry tools are constructed of plastic material, lightweight, easy and handy to be put into your school bags or in your desk Wide application: math geometry tool set are useful tools for architects, engineers, artists, designers, students, teacher and so on; Good for students in school use