Lava Red AB MobyDuo Bead. MobyDuo Bead - These high-quality Czech glass beads feature a flat bottom and arched top. The slender, 2-hole beads can be used as connectors, spacers or to add a curved profile to your projects. MobyDuo beads measure 3x8mm, have two .8mm parallel holes and come in a pack of approximately 90 beads.