Encourage your children's creativity, imagination and love of vehicle play with the 4WD Crusher tank building set! with 249 classic K'NEX pieces, this building toy for ages 7 and up gives children an outlet to learn and enjoy themselves at the same time. The K'NEX building system is composed of colorful plastic rods and connectors that snap together with a simple "click"! with the included motor, build 3 different vehicles, one at a time, that can virtual scale anything - a first for a K'NEX vehicle! the included illustrated instructional booklet guides your engineer in constructing truly amazing creations. In the process, this educational engineering toy will put your child on a path towards a better understanding of steam (science, technology, engineer, arts, and math) subjects. It is proudly made in America and was tested to the strictest quality and safety standards, ensuring that children will enjoy a hassle-free playtime experience. Encourage your children's creativity and brain development with the K'NEX 4WD Crusher tank building set today!.