4 DRAM (15 mL) AMBER GLASS VIAL. A general purpose amber vial with external threads. Made from Type 1, Class B (51 expansion) borosilicate glass. Low alkali content. Borosilicate glass vials are free of calcium, magnesium and zinc. Vials come with black phenolic closures with white rubber liners. Closures are packaged separately from vials. 20.5mm x 70mm. 18-400 thread finish. Non-sterile. 240 per case.