500pcs Adabele 304 Grade Surgical Stainless Steel Hypoallergenic 4mm (0.16 inch) Small Open Jump Rings (Wire 0.7mm/21 Gauge/0.028 Inch) for Jewelry Craft Making SJF83-4

Material: 304 grade stainless steel which is safe, surgical grade, hypoallergenic, and tarnish resistant metal ✦ Suitable for daily wear, outdoor, shower, gym and sports; ✦ Highly resistant to discoloration, tarnish, sweat, heat, water, smudge; color lasts forever ✦ Ring size: ~ 4mm (~ 0.16 inch), Wire gauge/diameter ~ 0.7mm / 21 Gauge / 0.028 inch which is standard wire diameter;