10 gauge ~ 2.5mm > 3/8" diameter (10mm)

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10g Circular Barbell by Body Circle Designs
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10g Circular Barbell by Body Circle Designs Circular Barbells 10g - 5/16" diameter - 3/16" balls Stainless Steel

10g Circular Barbell by Body Circle Designs

BCDCRS-1008
Closeout!
$33.48
$16.74
each
10g Gold Circular Barbell
2g Gold Circular Barbell Circular Barbells 2g - 15/32" diameter (12mm) - 10mm balls Gold Stainless

10g Gold Circular Barbell

CRP-10125
15/32"
$7.98
each