EASY CARE - The Sweese plates are smooth, can be cleaned easily in warm water. No need to worry about stubborn sauce stains or sticky dessert. PRO-GRADE PORCELAIN & SAFE FOR DISHWASHER, MICROWAVE, AND FREEZER - The large rectangular platters are made of durable porcelain, a type of premium LEAD-FREE ceramic, chip-resistant and more sturdy than stoneware.