K-Nex-79008-2176-Piece-Building-Simple-Machines-Class-Set-for-up-to-26-Students-K-Nex-79008-The-K-Nex-79008-Building-Simple-Machines-Class-Set-helps-to-introduce-your-students-to-the-scientific-concepts-associated-with-simple-machines-including-levers-pulleys-inclined-planes-gears-wedges-screws-wheels-&-axles-P-P-The-set-makes-15-different-models-&-contains-2176-K-Nex-parts-sufficient-for-24-to-26-students-P-K-Nex-79008-Building-Simple-Machines-Class-Set