This circular barbell is made from 316LVM ASTM F-138 implant grade stainless steel. It is internally threaded for comfort during insertion and has countersunk acrylic ends for a precision fit.
If you are unsure which size ball to choose you may want to select the standard ball diameter which is always the largest diameter listed. (Last one on the list.)
NOTE: do not use alcohol on acrylic, it will crack.
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