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lesjoefors springs are mechanical energy storage structures, primarily used in ancient ballistae and other crossbow-type weapons. Torsion springs store energy by twisting or rotating elastic materials that are soft and highly tough, thereby imparting a certain amount of mechanical energy to the projectile. Modern torsion spring torque bars are mostly made of steel with good elasticity, and their forms have varied greatly; examples include the hairsprings in mechanical watches, the power springs in toy gyro guns, and the torque bars in tanks and automobiles. Torque bars are compact yet deliver high torque, making them ideal as shock absorption components for transportation vehicles.