Simple Machines

Pull, Lift, and Lower: A Book About Pulleys (Amazing Science: Simple Machines)
$7.95
Describes many different kinds, uses, and benefits of pulleys. Provides examples of pulleys by showing a flagpole, a crane, an elevator and window blinds.

K'NEX EDUCATION Intro to Simple Machines: Levers and Pulleys-178 pcs
$30.99
6 and 8 year old grandsons and their father "play" with this educational kit together for hours at a time. Always something new to learn. The scientific concepts are easy to understand with this hands-on approach to learning.

EARLY SIMPLE MACHINES III SET
$114.95
This product was just what I needed to teach my summer enrichment class about simple machines. I received it very quickly, also.

Simple Machines Series: 4-in-1 Multipack, Hydraulic Machines
$34.95
The instructions used Metric measurements so that was an added learning dimension. They are simple wooden toys that do take an adult's help to construct.