The Charles Leonard Plastic Ruler is a must-have tool for any student or professional. This pack of 36 rulers is made of durable plastic with a double beveled edge and pencil groove, ensuring precise measurements every time. The raised calibrations show 1/16 inches on one edge and millimeters on the other, making it versatile for a variety of projects. The rulers also feature holes for easy storage in ring binders, keeping your workspace organized and clutter-free. With its clear design, these rulers are perfect for use in any setting, whether it's in the classroom, office, or at home.