I used a little too much 'elbow grease' trying to remove the knobs on my GE Stove trying to clean them. I thought they were metal, but they are plastic and I cracked the inside part on 3 of them. I am so happy Appliance Parts Pros sells these knobs for half the price of GE Parts! I did not realize how expensive they are. Ordering was easy and they were delivered in 2 business days!