40 ml (10 dram) Amber glass vials, no caps. Amber vials offer protection from harmful light and uv rays for light sensitive products. 27.50 x 95 mm, 10 dram (40 ml) Amber borosilicate glass vial with 24-400 neck finish. Made of type i borosilicate glass, providing exceptional resistance to heat shock and chemical leaching. The glass is non-porous and has no catalytic affect. Because the boron oxide particles in the glass are so small, the silicate is held more closely together, resulting in a much stronger glass for your laboratory needs.