Ah . . . the humble but essential open jump ring.  Most jewelry designers would agree running out of jump rings, especially when you are in the zone, is just the pits!  Stock up, because you know you'll use them. 

These jump rings are sturdy and an essential size for most jewelry applications.

*Sold in packs of 10. Roughly 20 gauge

Available in Gold Filled

Measurements approximately:  4mm  x 4mm x 1mm