48 12mm Round Mardi Gras Beads Pack by Accent Annex. $2.60. You can't have a true Mardi Gras celebration without plenty of beads! Each pack of Mardi Gras beads includes a dozen 48 inch, 12mm round strands of authentic Mardi Gras tradition. You can never have too many beads at a Mardi Gras celebration. Stock up now, and it's sure to be a night to remember.