16 Gauge Internally Threaded Surgical Steel Gem Set Flat Bottom Dome for Internally Threaded Dermal Anchors. Available in variety of colors. Gem bead size is available in 3mm, 4mm or 5mm 2.5 mm. Raise Base Surgical Steel Features Press-Fit 4mm gem COMFORTABLE TO WEAR: Well Priced Piercing Set; With Expensive Looking; Comfort Fit Design; Easy to Put on and Won't Easy to Slip Off. Cute and Stylish Design, Firm and Easy to Use. Adopted Simple Design, Smooth Surface. 100% Customer Satisfaction. Sold and Ship from USA