Czech Glass MiniDuo Beads in jet black DU0423980 are 2-hole seed beads that measure 4mm in length and 2mm in width, making them 20% smaller than the original SuperDuo beads. Each bead features two holes with a diameter of 0.8mm. They are packaged in a hangable plastic tube containing 8 grams of beads, which is approximately 160 beads.