DIAMOND TECH-Fireworks Glass Rod Set-Opalino/Filigrana. Package contains 10 assorted colored glass rods used to create stylish beads and jewelry pieces. Opalino rods are translucent and Filigrana rods have a solid color inner layer encased in clear glass. Rods measure 13"L x 3/16" D. Assorted Colors. Co-Efficiency of glass is 90. Imported.