K nex 77053 352 piece simple and compound machines set for 2 to 3 students k nex 77053 the k nex 77053 simple and compound machines set is designed to increase students understanding of simple machines and how they make work easier this is achieved by investigating exploring and experimenting with fully functioning simple machine models p p the set makes 16 different models one at a time and contains 352 parts sufficient for 2 to 3 students it includes a detailed teacher s guide wit