Students will explore through hands-on investigation concepts such as gearing up/down and increasing speed/force as they build crank fans, egg beaters and more. Includes building instructions for 6 different models with real-life photo and key facts. Complete set includes building materials in a sturdy divided case, teaching resource CD (with teaching notes, building projects and extension activities) and student building guide. 198 pieces. Made in the USA. Grades 2 and up. Sold by Gryphon House, Inc. Ships from Kaplan Early Learning Company.