For your convenience, serum vials can be offered with a writing patch, graduations, and with a range of seals and stoppers including I-Loc and open-top screw colored closures. Our serum vials solutions are founded upon USP660 Type I borosilicate glass and are available in case, pallet, and custom configurations in sizes ranging from 2ml to 20ml clear and amber glass, with 13mm and 20mm crimp