• Icy tanzanite purple color receives a silvery luster in these Matubo SuperDuo beads. Seed beads are essential for jewelry-making, and these Czech glass seed beads offer a unique, innovative shape with two stringing holes for creative possibilities. With tapered edges and a shape that nests up nicely when strung, these beads are perfect for weaving, floral designs, and more. There are approximately 125 beads in each 8.5 gram tube.