Open Top Crimp Cap with CLEAR PTFE/Red Rubber , sample vial cap ,PTFE septa ,bottle cap . size: 8, 9, 10, 11, 20mm Used for chramatography labrotaries Different colors of PTFE films are avaiable FEATURES Manufactured to OrderConditioned for Ultra Low BleedSoft, Strong Premium SiliconeBorn on date is on each package BENEFITS Reduced handling/contaminationNo interfering peaksEasy needle penetration/resealabilityEasily control/identify inventoryno need to wash, ready for use