Heavy Duty Grippmats by Dexas are durable, lightweight, non-slip and flexible. These cutting boards are made of non-porous and non-absorbent polypropylene that will not dull knives. The underside of each board features a non-slip Santoprene backing to grip tightly to counter surfaces for safety. Set of four Grippmats, each measuring 11 by 14 inches. Dishwasher safe!