These are ultra heavy duty stainless steel jump rings. The thickest jump rings I carry. The kit includes 8mm and 9mm in 1.5mm thickness (15 gauge), and 10mm, 11mm, 12mm, 13mm and 15mm in 2.0mm thickness (12 gauge). This assorted kit contains all of these sizes (they are also sold separately in a separate listing).
These are very thick and are not opened and closed easily. You will need pliers heavy enough (and hand strength). I personally use
https://www.etsy.com/listing/453950692/flat-nose-pliers-63mm-wide-head-heavy
and
https://www.etsy.com/listing/453723836/chain-nose-pliers-heavy-duty-jewelry
This Stainless Steel is not bright white silver but rather a more muted silver. These are shiny however.
Made of 304 grade stainless steel. Non tarnish and hypoallergenic.
Contains about
75 pieces 8mm,
55 pieces 9mm,
34 pieces 10mm,
26 pieces 11mm,
23 pieces 12mm,
20 pieces 13mm and
14 pieces 15mm.
I do not count them as I make every kit. I just fill the bins as much as I can and have found that it's turns out to be about these amounts.
All jump ring dimensions indicate outside diameter of the ring when closed.
If you want to refill just some of the items in this kit they can be found individually at
https://www.etsy.com/listing/597042064/jump-rings-stainless-steel-ultra-heavy
and
https://www.etsy.com/listing/542357167/extra-heavy-duty-jump-rings-100-pieces
There is more!!! See all of the stainless jump ring kits at
https://www.etsy.com/shop/JewelryToolBox?search_query=stainless+steel+jump+ring+kit
Visit the shop -> jewelrytoolbox.etsy.com
Save on Ultra Heavy Duty Jump Ring Kit, Stainless Steel, Assorted Sizes, 12 to 15 gauge Thickness, (1.5mm to 2.0mm), Closed Unsoldered, JRK 9UHC with a Etsy coupon