Borosilicate glass vials Screw-on black phenolic caps Capacity 2 DRAM (1/4 fl oz) Dimensions 17 x 60mm High quality clear Borosilicate glass vials, made in the USA. These vials may be used in various applications, including liquids or dry goods. All vials come with screw-on black phenolic caps attached. The DRAM is the traditional unit of measure for vials. DRAM = 1 8 Fluid Ounce.