Nose Ring Pyrex Glass Nose Screw Flat Top Retainer Hypoallergenic. Material: Glass , Solid and Durable, Rarely Fade and Rust, Hypoallergenic and Nickel Free; High Polished Surface, Very Smooth to Wear, Extremely Easy to Clean. Thickness: 18G(1.0mm); Ball Size: 2mm; Wearable Bar Length: 6mm. 30 Days Exchange or Money Back Guarantee and Excellent Pre-sale Consulting and After-sale Customer Service.