OLFA Frosted Advantage 12.5x12.5 Inch Square Acrylic Ruler is non- slip for st...OLFA Frosted Advantage 12.5x12.5 Inch Square Acrylic Ruler is non- slip for stable and safe cutting. Frosted back with black grid lines for clarity on light- and dark-material. The large bold black numbers are easy to read. The rulers have black grid...mehr