About This Stud This shiny butterfly flat back stud adds a touch of shimmer and charm to your ear stack. Lightweight, secure, and comfortable enough to wear all day and night. This jewelry is crafted entirely from ASTM F-136 implant-grade titanium, making it 100% safe for new piercings and trusted by piercing studios worldwide. Each piece is set with AAAAA-grade cubic zirconia, giving a super-sparkling shine that lasts. Plus, it’s completely tarnish-free, ensuring your jewelry stays beautiful and brilliant over time.Details - Sold as a single - Bar Gauge and Length: 16G-6mm. Need extra post? You can purchase additional posts [here]. - Ultra Shine Crystal AAAAA Cubic Zirconia - Ultra Shine Amethyst Purple AAAAA Cubic Zirconia - Ultra Shine Emerald Green AAAAA Cubic Zirconia - Closure: Push in - Made of solid implant grade titanium / Gold version is coated in 18k gold PVD Plating - Flat Back Disc Size: 0.15" (4mm) - Waterproof / Hypoallergenic / Nickel Free