Bought this for my 5 year old son for Christmas. This is our first experience with Zoobs and I am so glad I ordered them. They are great. Unlike so many toys that only do one thing, the possibilities with these are endless. My 5 year old can build with them easily. On Christmas day while I was busy reading the directions my son had already built himself a car. I thought they seemed a little hard to snap together, but even my younger almost 4year old son has figured out how to make simple things with them. The set comes with 12 wheels, so there's enough for a vehicle for both boys. My 5year old has been making matching vehicles for himself and his brother to play with. They aren't super sturdy vehicles, but sturdy enough to race around the house, with occasionally stopping for repairs. The wheels roll really well, and it's really neat for the kids to be able to play with what they've made.