MATCH ALL YOUR OUTFITS - red crystal cufflinks and studs, match all your shirts from regular formal shirt to French shirt. STAY SNUG ON SHIRT - High elastic cufflinks closure back and flat studs base are designed to not only firmly attach to your shirt but to stay there. SPECIFICATION - 20mm for cufflinks and 11mm for studs, the cufflinks and shirt studs set will come to you with a Luxury gift box BEST GIFT - The cufflinks and tuxedo studs set will be the best choice for husband, boyfriend, father, friends, and family.