Sterling Silver Jump Rings - RoundClosed round rings in 22 gauge. 4mm outside diameter. .925 sterling silver.
These jump rings are half-hard. This means that the metal is going to be fairly easy to open and close, but it also means that these rings can open easily. If you are using a jump ring to connect 2 parts together, you should work harden the ring or solder it closed.
Work hardening can be accomplished by hand or using a tumbler. To work harden by hand, place the jump ring on a bench block and tap a few times with a rawhide mallet or nylon hammer. this will distort the metal, so you may prefer to work harden in a tumbler.