[Durable Material] Each bowl is made of high quality stainless steel that resists dents and rust-proof. They feature a reflective finish on the inside and a brushed finish^ [Stackable Design] A deepening bowl type for mixing ingredients without spills, these stackable mixing bowls are dishwasher safe, compact and are designed to nest in your kitchen cabinets for the perfect fit. The nestable, space-saving design keeps your kitchen clean and tidy. ^ [Easy to Clean] These bowls can be easily cleaned by hand with soap and water or in the dishwasher. But the airtight lids are hand wash only because using the dishwasher would deform them. The bowls are safe in the fridge, freezer and preheat oven.