Rigid phenolic construction with a black satin finish. Mobile straightedge affords frictionless operation through the floating action of the nylon rollers mounted on the blade. The rollers retract at a touch, securing the blade for accurate drawing. This is a mobile parallel straightedge that is designed with elevated Plexiglas® edges that eliminate inking smears. Full-length finger lifts for easy handling and side tension guides eliminate side travel. Comes with all mounting hardware and installation instructions.