(100pcs) Material: 316 grade stainless steel is the Premium Grade in the stainless steel family; 316 stainless steel is safe, surgical grade, waterproof, hypoallergenic, tarnish-free, durable metal; Suitable for daily wear, outdoor, shower, gym and sports; Highly resistant to tarnish, corrosion, sweat, heat, water, smudge;
316 stainless steel is a common choice for surgical devices, biomedical implants, body piercings and body modification implants; It is an excellent material for use in jewelry due to its low risk for allergic reaction and its ability to tolerate water; it's generally considered hypoallergenic for most people, and great for making non-rusting everyday wear permanent jewelry and crafts;
Opening size/the widest size: about 10mm (0.4 inch), the depth of cone is about 7mm (0.28 inch); Inner hole diameter: about 0.9mm (0.035 inch)
Color: Stainless steel; Safe craft and jewelry making supplies
A material and quality assurance certificate of these non tarnish 316 stainless steel products issued by Adabele, U.S. A. is included; these Items are packaged in Adabele's trademarked bag