The wheels roll freely and are made of rubber.In addition,the rear wheel has a pull back function,which means that when you pull it back,it will wind up; if you let it go,it will roll.The door can be opened to reveal interior details such as seats,steering wheel and instrument panel.The back door is open, too.These toy models are very suitable for children and adults.Collect them or play with them.If you encounter any problems, please contact us