Details:Acrylic, durable plastic 12" ruler is ideal for students. Beveled edge acts as an excellent drawing and drafting guide. Standard and metric markings simplify measurement tasks. Convenient two and three ring binder slots enable easy storage. Imperial (English)/Metric measurement system. 1/16" and metric scales. Assorted: Red, Yellow, and Blue (no color choice). Sold as a pack of 36 rulers.