yes it is
To create a DIY car door protector for dogs, you can use a large piece of durable fabric or a waterproof material like vinyl or plastic. Measure and cut the material to fit the inside of your car door. Attach the material to the door using adhesive Velcro strips or suction cups. This will help protect your car door from scratches and dirt caused by your dog.
doorknobs can be made out of metal, gold, or copper
Car door panels may be made of a number of different materials. Most of these panels are made from metal or plastics.
Metal lol
Steel
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We can take the style from movie as they take a thin part of material put in the car door from outside and try to move it hock.
The same material as your car or mine.
Polypropylene
There should be a paper label attached to the door-jam on the driver's side door.
It will be made of many components the casing material will not matter much.