Encourage your child to come up with their own designs or they can follow the challenge cards, which include how to build different pieces of equipment on a playground (a twisty slide, a swing set, a seesaw and more). Reproducible worksheets based on the engineering design process are included. Slide measures 6" long. Set features 104 pieces, including 10 double-sided challenge cards and activity guide with reproducibles. Ages 5 and up.