4mm Ball End Flat Back Stud Earrings Minimal stainless steel flat back ball stud earrings with smooth 4mm ball ends and a comfortable flat back design. Hypoallergenic, tarnish-resistant, and perfect for everyday wear. Great for cartilage, helix, conch, tragus, or lobe piercings. • 4mm ball end • 20G gauge • 6mm post length • Stainless steel • Brand new #earrings #piercing #cartilage #minimalist #stainlesssteel