These multilayer mats are usable on both sides with function and versatility in mind. The on-inch lines have two sets of numbers around the perimeter of the mat that can be read left to right or right to left, so you will never lose your place or have to count backwards! The mats also have angled lines at 30 degree, 45 degree, and 60 degree as well as 1/8in markings across the entire length and width of the mat, making accurate cutting even easier.