These are actually safe because the metal used is tuned to the metal in the cavity of the oven.
Microwave with metal rack inside.
The second is a feature of a combination microwave with grill.
Although keeping metal out of the microwave is a key part of cooking safety some models now sport a gleaming center metal rack.
For your further convenience it features sensor cooking options to automatically adjust cooking time and power level for the optimum results.
The first is a cooking rack designed to give you additional space in a traditional or solo microwave oven which only uses microwaves to cook food.
Samsung me21r7051ss over the range microwave.