Let your kids build their own race cars or powerful ATV rides with the K'NEX Revvin' Racecar 2-in-1 Building Set! Unleash thier creativity as they make their own for open-ended and imaginative fun! This educational engineering toy consists of 370 colorful parts and pieces made of durable plastic. 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. Expand your imagination as you build and customize motorized cars. Easy-to-follow, step-by-step instructions are included to guide children through their building adventures. Large illustrations clearly show how to build the two cars and inspire children to come up with their own designs. As they connect the different parts together and discover how the system works, they're strengthening their hand-eye coordination, fine motor skills, problem-solving skills, and spatial awareness as well as enriching their imaginations! This construction education toy requires two "AA" batteries. It is recommended for ages 7 and up.