Omnigrid mats have several unique features that quilters appreciate: One side features a medium green background with bright yellow grid lines and the other side features a solid grey without grid lines. Both sides feature a forgiving surface and will not damage your rotary cutter. The grids on these mats feature 1/2-inch markings to the 1/8in and a full surface grid with 45 degree angles as well. This set also contains two of Omnigrid"s acrylic rulers: 1-inch by 6-inch and 4-inch by 4-inch. Mat measures 8-7/8-inch by 5-7/8-inch with an 8-inch by 5-inch grid. Imported.