BOLA Junior practice balls are manufactured specifically for use with the BOLA Junior Bowling Machine. The standard Junior balls are orange and weigh 70 g (2.4 oz) and are slightly smaller in diameter at 68 mm than the adult BOLA balls at 71 mm. The Junior machine will deliver these balls at speeds of up to 65 mph and produce a realistic flight and bounce. Junior balls also work in the standard BOLA machines.
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