This set takes the flexible cutting mat to new heights of usefulness. Each of the four 12" x 15" mats is made of non-absorbent polypropylene, soft enough to not harm fine knives, flexible enough to roll up to funnel food into bowls and pans, but tough enough to go in the dishwasher for clean up. The full-width backing is santoprene, a non-slip material that ensures your mat stays in place on the counter while you're using it. The four colors let you keep mats separated for use with meat, fish, vegetalbles, poultry, etc.