Devardi Glass Lampwork, Beadmaking Glass Rods, Clear Encased Cobalt Blue Aventurine, 1/4 lb Devardi Glass Rods COE 104, soft glass. Sparkly Cobalt Blue Aventurine encased in clear soft glass. Make beautiful glass beads, marbles and other items fast. Sizes of the rods vary from 6-10 mm thick and 8-12 inches long. About 6 rods. Use with an all propane/Mapp torch, or propane/oxgen torch. Please click the blue "Devardi Glass" above to see all our listings.