These dark hematite jump rings are 4mm with a thickness of 0.6mm. They work well with black chain and findings. They are made of stainless steel heavily plated in hematite / black.
They are unsoldered but will arrive in the closed position.
Non-tarnish and hypoallergenic.
Outside diameter when closed is 3mm.
Inside diameter is 1.8mm.
Wire thickness is 0.6mm (about 21 gauge).
All dimensions are approximate.
Sold in lots of 50.