20 mL (5 dram) Amber Glass Vials, No Caps. Amber vials offer protection from harmful light and UV rays for light sensitive products. 27.75 x 57mm, 5 dram (20mL) Amber Borosilicate Glass Vial with 24-400 neck finish. Made of Type I Borosilicate glass, providing exceptional resistance to heat shock and chemical leaching.