Corelle Coordinates 12-piece bowl set can be used to store ingredients or leftovers. It has 6 stacking bowls and 6 lids of various sizes. These Corelle Simple Lines bowls come with BPA-free lids that offer an airtight seal to lock in the food's flavor and freshness. Items in this bowl set are made of stainless steel that resists odors, stains, corrosion, chipping, heat and impact. Dishwasher safe.