Made of high-quality bakelite, high temperature , high friction , dishwasher safe, insulating, anti-rust, sturdy and . The plastic knob Heat- can prevent your hand from injured. The screws are easy to fix, just put the knob,rubber gasket and metal gasket correctly,and then use screws to tight them. It is also very easy to clean, after using it, you could use wet cloth to clean it. Pot Lid Knobs Fits most lids to replace the old or broken are an perfect replacement.It's comfortable to grip, simple and easy to install. The pot replacement knob is suitable for most covers, such as kettles, oil pans, frying pans, lids, replace destroyed knobs, comfortable to hold, easy to use.