No, they are used to balance wheels and tires that are out of balance.
When a new tire is mounted on a wheel, it has to be balanced on a machine that spins it, locates the light side, operator adds weights to make it balance.
Holy shit my brother I had seen these things for years, thrown in the ground and always figured they had something to do with cars, only didn't know WHAT. you sir have scratched that mental itch and my brain lobes are forever thankful
I got a flat tire and needed to replace the tires. Since I was going to get new tires soon anyway my quick replacement was a used tire different from my others.
My car was unbalanced and it felt so weird, had to keep checking if I got another flat because the vibration feeling was so off.