Preschoolers will have fun building, measuring, learning about cause and effect, and more with this bundle of engaging STEM products. The 24-page activity guide targets preschool activities for all of the included items. Includes Primary Science Mix & Measure Set, Simple Tape Measure, Gears. Gears. Gears.® Building Set, 1-2-3 Build It.™, and more. Ages 3+/Grade PreK+.