The cams are eccentric rather than round, and so their effective radius changes as they rotate. The pulley/cam system also confers a benefit called "let-off." As the string is drawn back, the cams rotate. The higher-rigidity, higher-technology construction also improves accuracy by reducing the bow's sensitivity to changes in temperature and humidity. This rigidity makes the compound bow more energy-efficient than other bows, as less energy is dissipated in limb movement. The pulley/cam system grants the user a mechanical advantage, and so the limbs of a compound bow are much stiffer than those of a recurve bow or longbow. In general, compound bows are widely used in target practice and hunting. In modern archery, a compound bow is a bow that uses a levering system, usually of cables and pulleys, to bend the limbs. Archer Erika Jones shooting a compound bow.
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