Niche-Finds 5 Pairs of Surgical Stainless Steel Stud Ball Earrings  4mm, 5mm, 6mm, 7mm, and 8mm Diameter **THESE EARRINGS DO NOT OXIDIZE! IF YOU NOTICE A SMALL AMOUNT OF TARNISH, IT IS SURFACE CALCIFICATION AND EASILY REMOVED WITH A WET CLOTH - IT IS NOT CORROSION; THESE ARE GENUINE STAINLESS STEEL** 316L Surgical Stainless Steel; PLEASE NOTE THAT ALL STAINLESS STEEL DOES CONTAIN NICKEL (316L contains 5% as a binder). Severly sensitive individuals may experince irritation. High quality, shiny finish 5 Sizes you can switch between, or wear at the same time