Modern, ergonomic compass perfect for all ages! Features a twist-lock device that secures the legs in place for accurate circle size and guaranteed precision. Innovative Safety Tip automatically retracts when you close the compass legs, to avoid potential injuries in a bag or case. Integrated distance measuring arm is graduated in both inch and metric. Set includes 6" shatter-resistant protractor made with translucent material and beveled edges for ease of use. Maximum Circle Diameter Created [Max]: 12"; Material(s): Plastic; Color(s): Randomly Assorted; Color Assortment: Blue; Green; Orange; Red.