16 or 14 gauge, internally threaded ends. Made of ASTM F-136 TI 6AL4V ELI Titanium. (16g 3mm x 3mm, 14g 4mm x 5mm) Gold and black options are PVD coated/plated. Check out our internally threaded labrets, horseshoes, and curved barbells if you need a post for these beads! Sold individually.