They're 1/32 scale, so 4 1/2 to 5 inches. I've raced these for years and there lots of fun, addicting and can get a bit expensive like any other hobby
They also did the first gen camaro but the Sunnoco cars were sold out long ago, only can find them on ebay. My favorite place to buy is Fantasy world hobbies. Cost on these is around $48 although you might be able to find them cheaper