This Green Spiked Barbell is such a fun piece of jewelry to wear. It comes in both 16G and 14G. Each both come in 5/16" (8mm) with 3mm x 4mm spikes and 3/8" (10mm) with 4mm x 4mm spikes. It is made with green PVD on 316L stainless steel. Great for eyebrow, rook, daith and vertical labret piercings. Sold Individually (1 pc). Recommended for healed piercings. It is externally threaded.