Black Heavy Gauge Thick Segment Ring
Segment rings are just like BCRs, but instead of a ball, a segment of the ring itself clips out - hence the name.
This ring is surgical steel, and is available in 3mm, 4mm, 5mm thicknesses.
The bar length is the internal diameter of the ring. You do not measure the outside as this is not considered the wearable area.
Please note, you will need ring opening pliers to fit these as they won't open by hand.