Avoid cross contamination by using different color for each food group. Measures, 15" x 11"/38cm x 28cm. 4 piece set includes red, orange, lime green and blue. Use with grid side down on flat surface or counter top - protects your counter top. Non porous, won't retain odors or dull knives. Great for home, camping and your RV. FDA approved. Dishwasher safe.