Gauge:18g (1mm), 16g (1.2mm), 14g (1.6mm). Bio Flex Barbell with Clear BallsRetainer. 18g (1.0mm) x 3mm, 4mm balls. 16g (1.2mm) x 3mm, 4mm balls. 14g (1.6mm) x 3mm,4 mm, 5mm balls.
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