This pulley block assembly set provides a versatile collection of components from which pulley systems of many different configurations can be built. The set is an economical alternative to purchasing separate discrete pulleys, offering the flexibility to demonstrate single, double, and triple sheave arrangements with varying pulley diameters. The set contains 15 plastic pulley frames (5 single, 5 double, and 5 triple sheave), each provided with a removable bearing pin and a pair of hooks. Also included are 30 plastic plain-bearing pulleys: 10 each in diameters of 25mm, 38mm, and 50mm. The components can be assembled into numerous configurations for teaching the mechanical principles of pulleys, mechanical advantage, and force redirection.