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The purpose of this study was to establish guidelines for proper selection of soccer balls for elementary school students. Ten youth soccer team players aged 8-11 years, who all kicked using their right foot, were included in this study. The participants were asked to perform an instep kick with full strength to hit a stationary soccer ball toward a target 8 m away. Two types of balls (with different masses) were used in the experiment. A size 4 ball weighing 360 g and a size 3 ball weighing 300 g. For data collection, a Vicon optical three-dimensional motion analysis system was used. For kinematic calculations, ball velocity, toe velocity, and rebound ratio (ball velocity / toe velocity right before impact) were calculated. A significant difference was observed in velocities in both kicks (p