Czech 11/0 Seed Beads. Czech seed beads made by Jablonex are perfect for loom work, Native American beading, stringing and are excellent for bead embroidery. In the beading community Jablonex seed beads due to their better uniformity are superior Czech seed beads. These seed beads are donut shaped. Toho seed beads are more cylinder shaped. Each tube contains aprx. 9 to 12 grams. This weight varies due to bead properties. The tubes are 2.5 inches long.