Office Depot Transparent 12" Plastic Ruler for 3-Ring Binders (Set of 4 Assorted Colors) Set of 4 Rulers: (1) Blue, (1) Clear, (1) Fuchsia, and (1) Graphite Transparent, flexible and durable. Fit 3-ring binders. Scaled in 1/16" increments on 1 edge, metric on the other.