ETA hand2mind Simple Wooden Machine Collection: Work， Force， and Energy Models， Set of 12<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Precision made wooden models</li><li>Set includes 12 different models</li><li>Each model includes a teacher’s guide</li><li>Models included are: inclined plane/cart， gear train， pulley， screw， pendulum， gear rack， lever， motion converter， fulcrum balance， wedge， block/tackle， and wheel &amp; axle</li><li>Provides great hands-on experience with concepts of work， force， and energy</li></ul></div><img src="http://ecx.images-amazon.com/images/I/519t9xVXxfL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31nM6OA6kXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/318n0vDaJZL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/317dGxmlS9L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31d4cb2w53L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31OF9JfvuAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Zpdt5iD%2BL.jpg" noproxy>