Flip off vial/top cap/seal are made of plastic and aluminium also named aluminium-plastic combination cap/seal. A wide variety of alumium caps are including 13mm, 20mm,28mm, 32mm and 34mm standard or

Pharmaceutical glass vial are made of borosilicate glass.Also named serum vial. A broad variety of specifications are including 2ml, 3ml, 4ml, 5ml, 6ml, 8ml, 10ml, 15ml, 20ml, 25ml and 30ml glass vial