Product review (2 stars): They "look" like stainless steel because they use a layer of thin ...
Be warned! These knobs are NOT stainless steel. They "look" like stainless steel because they use a layer of thin stainless foil over a plastic substrate. They will crack and deform from escaping oven heat. My suggestion is to ALWAYS remove them before you use the Oven Clean (Very High Heat) mode of operation. Not a well thought out design. Not properly tested, IMO.