On your wedding day, it is traditionally correct to give something special to your groomsmen. What you give to them can be the same thing; i.e. wallets with their engraved initials,  money clips, belts, key rings, name plates, letter openers, or sneakers.

However, if you want to give something extra special to your best man that is acceptable as well.

Answer courtesy of:
Khaliyah Barakhyahu
Heavenly Haven Productions, Inc.