Mini Lindy was a line of small plastic model kits, about the size of Matchbox or Hot Wheels cars. They were part of the "Lindberg Line". They had rubber tires, chrome wheels and clear windshields. The axles were fit under a plastic tab that provided limited suspension actions. Some of the subjects are difficult to find under other formats, such as Hot Wheels. These are often mistaken for Hot Wheels or slot cars, and are fairly rare, but can be found on eBay and websites.
Some of the car subjects:
The last 8 were part of the Lindberg "Super Sport" series.
References
Mini Lindy Wikipedia(Text) CC BY-SA