Pulley is a type of simple machine that changes the direction of the applied force, with one or more grooved wheels connected by a rope. Pulley is used for lifting, lowering, or moving objects.The of pulleys is that they redirect force. We see how a pulley can change the direction of , the difference between fixed and movable pulleys, and the mechanical advantage gained with multiple / combined pulleys. Features - Color: As shown. - Material: Plastic, metal. - Size: 37.00X15.00X8.00cm/14.54X5.89X3.14in - Pulley is a type of simple machine that changes the direction of the applied force, with one or more grooved wheels connected by a rope. - Pulley is used for lifting, lowering, or moving objects.The of pulleys is that they redirect force. - We see how a pulley can change the direction of , the difference between fixed and movable pulleys, and the mechanical advantage gained with multiple / combined pulleys. - Strict quality inspection system ensures you product. - Adopted from material, it is durable and use. - Note: This pulley block does't have dynamometer and weights. Package list: 2 x single pulleys 2 x double pulleys 1 x holder 2 x ropes