Omnigrid Cutting Mats are extremely durable and will provide you with years of successful cutting. They feature a true 1 inch grid with edge and angle line markings on one side for measuring and cutting. The 1/8 inch markings extend beyond the outer edge for both right and left handed users. Mat accommodates a standard folded width of 45 inch fabric, and is a convenient size for sewing and quilting classes, workshops, retreats and more. 18 x 24 inch.