Material: Knob cookware is made of bakelite and plastic, offering high temperature resistance, abrasion resistance, and anti-scald properties for long-term use. Package Contents: Cookware replacement parts include 5 pot lid handles, 5 stainless steel washers, and 5 screws. The right size fits most types of cookware, and the included accessories meet your needs. Comfortable Grip: The universal pot lid handle is ergonomically designed, providing a comfortable and secure grip to help prevent the lid from slipping. It features a simple appearance, and is strong and sturdy. Easy to Install: The pot and pan lid knob is simple to install without additional tools. The heat-resistant knob comes with a retention screw—just place the knob and metal piece, then tighten the screw. It is also easy to clean; simply wipe with a damp cloth to restore its appearance.