4M Wind Up Robots Kit Craft wind-up robots to play with using this kit. Wind up and race 4 different cardboard robots with friends and family. Included with the set are cardboard stock for 4 vibrantly colored robots and the wind-up mechanisms to make them go. All of the parts are made of safe, high quality materials. This set is recommended for ages 5 years and up. Challenge your child's imagination with 4M toys and kits. 4M educational toys cover a wide range of educational subjects and include science kits, arts and crafts kits, robotics kits, and more. 4M offers a wide range of toys and kits to let you build a clock, crochet a placemat, or turn your room into a planetarium--all in the name of making learning fun.