Olfa Frosted Ruler The Charm 4-1/2"x4-1/2"......OLFA Non-Slip, Frosted Advantage Acrylic Rulers are not your ordinary rulers! OLFA’s rulers are non-slip for stable and safe cutting and frosted 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 lines at every inch; dotted black lines mark the half-inch and black tick marks along the solid line mark the quarters and eights. The frosted back grips in place for safe, stable cutting but allows the ruler to be repositioned for small adjustments. For right-and left-handed use. Hole for convenient hanging. Available in 9 sizes. USES: The 4.5 x 4.5 is the perfect template for 4" squares used in 9 patch blocks, baby quilts, miniatures and charm quilts. Also useful for trimming half square triangles and small piecing. Great for papercrafting and trimming photos.