Multistrand silver filled wire is 3 strands of round 24 gauge AWG, which is 0.51mm, twisted together. 24g multistrand wire measures 1.08mm and is closest in size to 18g round, which is 1.02mm.
These rings are only available in filled wire, as the process snaps our solid wire at this size.
Inside diameter is mandrel size, not actual ring size.
These rings are sold individually.