Czech Super8 and SuperDuo beads are two-holed glass beads in the shape of a figure 8. Super8 beads are smaller than SuperDuo beads, similar to MiniDuos, and have narrower ends. Super8 beads measure 2.2mm x 4.7mm. A 5g bag contains approx. 190 beads. SuperDuo beads measure 2.5mm x 5mm; a 10g bag contains approx. 135 beads. SuperDuo beads are about 1/3 larger than Super8 beads. Holes are approx. 0.8 - 1mm.