Let your kids build their own race cars or powerful Atv rides with the K’nex Revvin’ Racecar 2-in-1 Building Set. It includes rods, connectors, and wheels that easily attach to one another in different ways to build and customize two different automotive models. It also features a battery-powered motor that brings your creations to life. Also, since Steam (science, technology, engineering, arts, and math) powers the fun of each and every K’nex building set, building with K’nex puts children on the path toward a fundamental understanding of Steam/Stem subjects. Gender: Unisex.