Product Description One side of the Omnigrid mat 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 24.75×36.75 inches with an 24×36 inch grid. Warning for CA Residents Prop 65: WARNING: Cancer and Reproductive Harm – www.p65warnings.ca.gov