SuperDuos by Matubo is 2-Hole Beads meauring 5.5 x 2.5mm. A 22.5 Gram Tube holds approximately 340 beads. These Czech glass beads are pressed for a uniform shape and size with a tapered design. The profile of the SuperDuo is much like an inverted hourglass, tapering at the ends and widening in the middle, and create a “honeycombed” or diamond pattern when stacked together. Their large hole size to bead size ratio makes them ideal for consistent bead weaving texture and multiple passes of fine beading thread, such as Fireline, Power Pro, KO Thread and Nymo. Create beautiful textures with the multitude of colors available! Measurements: 5.5mm long, 2.5mm wide (along string), 3.5mm thick. The two holes will accommodate wire or thread up to 20 gauge (.032″) thick.