My four-year-old received these when he was 2 or 3, and they're still in perfect shape. They're a nice, substantial cardboard, and they make three trucks when put together. The truck for each puzzle is a photograph, and the puzzle pieces outline it, so you really get the idea of the shape of the truck, with the big tires and other fun features.

I think the choice of fire truck, tractor, and dump truck was good. Those are popular vehicles for little kids.

I find that the puzzle is challenging for a preschooler without being too frustrating, because there's a finite number of pieces and there's a lot of immediate confirmation about whether the kid has put them together right or not -- as in, does it look like a truck yet?

The firetruck is definitely the most fun for my four-year-old, probably because it's the biggest. I'm not great with estimates and don't have the puzzle out right now, but it's likely over a foot long when pieced together. Littler kids can start with the other trucks, because they have fewer pieces to fit together.