Investigate and experiment with 8 functioning lever and pulley models designed to demonstrate science and technology concepts related to three classes of levers and fixed, moveable and combination pulleys and block and tackle systems. Build 8 different real-world models, one at a time. Models demonstrate 1st, 2nd and 3rd class levers along with fixed, moveable, and combination pulleys. Set includes building instructions with real-life photo and key facts and comes packaged in a strong plastic storage case with moveable dividers. · 178 K'NEX Pieces · K'NEX Education branded · Create replicas of real levers & pulleys · Storage container with dividers Availability: Usually ships the next business day. 78612 FREE GROUND SHIPPING ON ALL ORDERS OVER $75.00. Please entry FREESHIPPING in the coupon box on the second page of the checkout. Offer valid for the 48 contiguous states. Certain oversize and drop ship items are excluded.