Miyuki 15/0 Seed Beads - Duracoat Opaque Spanish Olive 15-4491. Also known as glass rocaille beads, Miyuki seed beads are known for their consistent round shape that allows for greater precision in beading projects. These premium, durable beads are made out of Japanese glass and come packaged in tubes for easy storage and organization. Get ready to create endless stringing, stitching and bead weaving projects with our large selection of colors, hues and finishes. Miyuki 15/0 seed beads come in 9g tubes containing approximately 2300 beads.