The Portion Plate for adults. 100% melamine, 9 1/2" in diameter, dishwasher safe. The Portion Plate is an interactive tool for teaching consumers appropriate food portions. Unlike a text-based paper educational brochure, The Portion Plate is an actual melamine, dishwasher-safe plate that offers a tangible demonstration of how much food we should eat. Not only are the plate's illustrated portion areas a good guide to follow, but the make up of a good meal is also presented. This means 1/2 of your plate should be fruits and vegetables, 1/4 of your plate whole grains and the remaining 1/4 lean protein.