Tunnel plugs crafted with black pvd on 316L stainless steel with a outer rim full of iridescent rainbow colors. Securely fit with a screw-on back for easy installation. The full length measures 11mm with a wearable area of 7mm, and sizes range from 0G (8mm) to 5/8" (16mm). For healed piercings. Externally threaded. Sold in pairs (2pcs).