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-inch markings to the 1/8-inch and a full surface grid with 45 degree angles as well. Mat measures 11-3/4 by 8-3/4-inch with an 11 by 8-inch grid. Imported. WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects and other reproductive harm.