Isomars *Pro Circle * Art # P45 *11cm/4.5" *Clear Plastic *Thickness : 1.8mm. *Half D 180° Protractor 6 Inches. *Protractor - 6" (360 degrees) made of clear plastic. *Made up of clear plastic , rate of transparency allows to see the medium below for easy positioning. Mechanical Pencil is designed for long-lasting use. Non slip grip for daily writing. It is the suitable tool for sketching and drawing. Superior drafting pencil for general and technical writing. Comes with eraser.