Fireworks glass rod set, multicolor, 10-pack. Co-efficiency of glass is 90. This assortment contains both filigrana and opalino rods. Filigrana rods have a solid inner colour layer encased in clear. The opalino rods are translucent, meaning that they are not transparent so you can see through them, and they are not opaque as you can see light through them. Ideal for beginning beadmakers. 10 assorted glass rods.