Replacement for Cat.Nos. 6-74504, 6-74512, 6-58501, 6-58504, and 6-58512. Closure is made from white polypropylene and has a pulp-backed aluminum foil liner. Top is suitable for marking. Suitable for use with some strong oxidizing agent scintillation "cocktails." Closures are packed 100 pieces per plastic bag, 10 bags per case.