Mix or Match Vehicles 2+4 from Popular Playthings is the amazing toy that lets kids build vehicles in 1,000's of different combinations. The unique magnetic locking system makes it easy to snap vehicles together and take them apart, over and over again. Set includes three powerful pull-back units so you can race with your friends. Fully compatible with any Mix or Match Vehicle Sets. For ages 3 years and older. Each of these giant combination sets allows you to build thousands of different vehicles. Your builds will be longer and even more amazing. Each set includes three powerful pull-back units so you can race with your friends and see who built the fastest, coolest vehicle! Recommended for ages 3-6 years.