Okones 4pcs Round Agate Black Tuxedo Cufflinks Studs Cufflinks Buttons Set for Formal Tuxedo Cuff Shirt 100%Nickel Free,Never fade!Diameter:2/5'' (10mm),two sides can be used 4 pcs natural agate black center&silver color edge studs High quality,deluxe,inexpensive Great gift for Birthdays/Anniversaries/Fathers Day/Businessman/Bridegroom/wedding/bridegroom Comes packaged in an elegant bag