Pressed beads have a molded pattern which is consistent from bead to bead. Surface quality can range from very smooth and uniform with well-defined edges, to edges that are very rounded, and surfaces that have dips, flow marks, and other irregularities. Seed Beads - Tiny type of bead most often used in weaving and embroidery. Seed beads are made of segments of drawn tubes of glass of various thicknesses, typically slightly oval in shape due to tumbling and polishing, the shorter dimension being through the hole. Smaller than Pony beads.