23" x 70" size easily covers and protects a larger surface area. Includes two 23" x 35" green selfhealing professional quality Olfa rotary mats and two mat clips to tightly hold the mats together for seamless cutting. The mats connect for continuous grid and numerical measurement. Doublesided with yellow grid lines on one side for precision cutting, solid green on opposite for general cutting. 1.5mm thick. Store flat.