Czech Two-hole Superduo Beads 5.5x2.5 Pastel Aqua 24gram Czech Glass. SuperDuos 2-Hole Seed Beads 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 Quantity: 24 gram tube -(Approx 360 beads)