Quilter's Select Rotary Cutting Mat 12" x 18"The self healing, multi layer mat is usable on both sides with a light background featured on one side and a dark background on the other. One inch lines with two sets of corresponding numbers are placed around the perimeter of the mat and read left to right and right to left never lose your place or have to count backwards! This versatile mat was created with function and simplicity in mind with 1 8, , and 1 markings as well as multiple angles. Tips