Shatter resistant plastic protractor has rounded corners & tapered edges. Slotted separation eliminates confusion of supplementary angles & is perfect for artists, students, designers & all craftsmen. It's actually two protractors in one, with the lower scale reading right-opening angles [<], while the upper scale reading left-opening angles [>]. Scales are 6" for the outer edge & 10 cm. for the inside edge. Material(s): Plastic; Ruler Size: 6" Ruler Edge; Color(s): Orange.