Mix ingredients, whip cream or eggs and knead dough with the KitchenAid 4-piece prep bowl set. It has bowls with lids of different sizes. Lids have a transparent design to easily see the contents. They offer an airtight seal to keep your food items fresh. These bowls are made of polypropylene that resists breakage. They come in red with a glossy finish. Dishwasher safe.