Ox & Bull Formal Onyx & Gold Tuxedo Set Pair of Cufflinks and Set of Four Studs Gold and Onyx Stud Set The set comprises a pair of Gold and Onyx cufflinks and 4 matching Gold and Onyx studs The cufflinks (5/8" Round) feature a bullet backing 5/8" Round Studs (3/8")feature a trigger mechanism back Designed by Ox and Bull Trading Co