Model drawing activities for the whole class as students follow along at their desks using the Bullseye® Compass (STP45701). Unique attachments fit a piece of chalk or a dry-erase marker. The Bullseye® Demonstration Compass features a Direct View™ Pivot Point and a Quick Set radius indicator with two radius holes for easy and accurate drawing of circles. Draw circles in 2"-32" diameter, construct and measure angles with built in protractor. Suction cup fits securely on board for accurate measurements and construction. Made of shatter-resistant SAFE-T® Plastic. Measures 19 3/4" long x 4 1/4" wide.