This single flared eyelet is made from 316LVM ASTM F-138 implant grade stainless steel. It has a perfect mirror finish both inside and out. This eyelet is 4g with a 1cm wearable length between the o-ring and flare. The eyelet is grooved and comes with one black o-ring. The 8g and 1-0.3cm gauge through 5.1cm gauge are not grooved. While the picture shows several eyelets to show you how they look from all angles, you are purchsing a single eyelet. Sold individually; order two to receive a pair.