Joke Collection Website - Cold jokes - There is a kind of roller skate pulley that can be installed on any shoe. What is that kind of pulley called?

There is a kind of roller skate pulley that can be installed on any shoe. What is that kind of pulley called?

Currently, we only know of extreme shoes that can be called roller skates and can be worn on any shoe.

And not all shoes can be worn

I guess the thing you are talking about is a toy... don't buy it

If you want to play, buy some messy roller skates and wear them out, the quality is not good and they make people laugh