Four pull-'n-go friction driven cars each measuring approximately 5cm long. Turbo Macs or Fast Macs were released in different countries and at different times. The Australian version consists of:

Ronald™ - Yellow Jeep,  Birdie™ - Pink Cruiser,
Officer Big Mac™ - Police Car,  Hamburglar™ - Red Sports Car.

Similar cars were released in 1991/92 called Burger Buggies.
These are push-along toys not friction driven and are slightly longer.

Turbo Macs are dated on the underside whereas Burger Buggies are not.
The label on Ronald's™ Jeep differs in size.
Officer Big Mac's™ Police Car differs in colour.