Product review (3 stars): Look good but have a limited life.
These probably deserve five stars, but because I have had this stove just over 5 years and this is my third knob purchase I am only giving them a four. It seems that after a couple years the plastic must become brittle and they break inside. They probably should be made our of a metal. I have looked for another knob unsuccessfully to use, so I am back to ordering more of these.