High quality and easy to read graduations make these chalkboard accessories ideal for any classroom. Can be used on chalkboards or whiteboards and have rubber pads to prevent scratches and provide greater grip. Complete set includes: chalkboard protractor; 45° triangle marked with both cm and inches; 60° triangle marked with both cm and inches; compass with rubber suction cup, separate metal point and whiteboard marker holder; 100cm ruler marked with both cm and inches; and T-square marked with both cm and inches.