Simple Machines unit with hands on experiements. Collect books to use for samples and information. Test included.
Set of 20 NEW books by Michael Dahl (5 copies each title, Library Bound Hardcover)
Titles: Inclined Planes, Wheels and Axles, Pulleys and Levers, available on this site under "hard goods". Will ship UPS or USPO book/media rate for lowest cost.