Half flat sterling wire is 12 gauge AWG, which is xmm x xmm. Inside diameter is mandrel size, not actual ring size. These rings are sold individually.

Half flat Argentium wire is 12 gauge AWG, which is xmm x xmm. Inside diameter is mandrel size, not actual ring size. These rings are sold individually.

Half flat silver filled wire is 12 gauge AWG, which is xmm x xmm. Inside diameter is mandrel size, not actual ring size. These rings are sold individually.

Half flat yellow gold filled wire is 12 gauge AWG, which is xmm x xmm. Inside diameter is mandrel size, not actual ring size. These rings are sold individually.

Half flat rose gold filled wire is 12 gauge AWG, which is xmm x xmm. Inside diameter is mandrel size, not actual ring size. These rings are sold individually.