Manufacturer, Waters. category, Micro Inserts. type, Insert. volume / package size, 250 µl. material, Polypropylene (PP). height, 29 mm Waters Polypropylene Insert, 250 uL, 1000/pkg - 186001729 Uvison.com Waters Polypropylene Insert, 250 uL, 1000/pkg - 186001729 - Pack of 1000 Polypropylene Vial InsertsVial inserts are a solution in applications