This double-sided cutting mat gives you twice the cutting life! Both sides have 1-inch grid lines with dotted lines at 1/4 inch increments. All four edges have rulers with 1/8 inch increments. There are also 30, 45 and 60 degree angle lines.Details:12" x 18"1" grid lines with dotted lines at 1/4" incrementsDouble sidedSelf healing100% polypropylene