Being an engineer I’m going to describe this in mathematical terms.
A jump ring is described by me as having an inside diameter, a gauge, a material, and a wire type.
- Inside Diameter – The size of the jump ring
- Wire Gauge – The thickness of the wire
- Material – Copper, Brass, Bronze, ect
- Wire type – Round, Square, Twisted, ect
This picture demonstrates the effect different wire types can have on the actual size of a ring.