These acrylic, durable plastic 12" rulers are ideal for students. The beveled edge acts as an excellent drawing and drafting guide. Standard and metric markings simplify measurement tasks. The rulers feature the Imperial (English)/Metric measurement system. Details:Assorted - Red, Yellow, and Blue (no color choice)12"1/16" and metric scalesBundle includes 36 rulersEasily fits into 2 and 3 ring binder slots