This Quilters Select ruler features easy-to-read lines for marking and measuring fabric, as well as multiple angles. Each ruler has a unique non-slip coating that makes for more accurate cutting! The one-inch lines with two sets of corresponding numbers that are placed around the perimeter of the ruler can be read left to right AND right to left ? which means you never have to lose your place or count backwards! Makes squaring blocks easier than ever! QSRUL3X18