StormDuo - White Teal Luster. The StormDuo bead is a PotomacBeads exclusive that is made with high-quality pressed Czech glass. Featuring 2 holes, StormDuos have a unique S shape with flat surfaces on the top and bottom that give them a versatility like no other. You will enjoy the endless design possibilities that this bead brings to your collection. Measuring 7x3mm with .8mm holes, these beads come in packs of 80.