BUILD your own engineering creations with this 108-piece STEM building set! DESIGN new twisting, turning Treadmobiles, or follow along with the included Activity Guide! MASTER engineering, critical thinking, and other STEM skills with every build! WORKS with all Gears! Gears! Gears! building sets! GIVE THE GIFT OF LEARNING: Whether you’re shopping for holidays, birthdays, or just because, toys from Learning Resources help you discover new learning fun every time you give a gift! Ideal gift for Halloween, Christmas, Stocking Stuffers, Easter or even for Homeschool.