Mat with Grid has several unique features that quilters appreciate. 1 side features a medium green with grid lines and the other side features a solid grey without grid lines. The grey side can be used for standard cutting. The markings are distinct and readable they also line up with Omnigrid rulers. The outer dimension is 1 larger which gives a larger cutting area. The mat surface is smooth which keeps the rotary blade sharper for longer. Mat measures: 12 x 18.