Super duo beads are oval two hole Czech glass seed beads. Two sizes: 2x4mm and 2.5x5mm. The middle of the bead is slightly thicker than the ends.
Twin bead, 2.5x5mm, two hole glass seed bead.
Super duo 5x2,5mm glass seed bead, with two holes.
Made in Czech Republic.
Super duo 2x4mm glass seed bead, with two holes.