TWIST LOCK FEATURE: locking mechanism on compass securely holds compass legs in place to ensure accuracy ERGONOMIC DESIGN: compass fits comfortably into any hand and the tip automatically retracts when closing the compass legs DUAL-MEASURING UNITS: measurement arm graduated in both inch and metric; compass makes circles up to 12 inches VERSATILE: compass works with pencils, pens and thin markers to maximize versatility INCLUDES: 1 compass and 1 shatter-resistance protractor in red, blue green or orange (*color is random and cannot be chosen at this time); protractor is 6"/15 cm