PP Blue Colour Cap with White PTFE/Biege Silicon Slit Bonded septa is supplied by Cyberlab. They are easy to remove. It ensures that proper seal is made. It has 6mm hole with White PTFE/Beige Silicon with SLIT BONDED septa for 9-425 vials. These caps can be fitted on screw neck short thread 9mm wide opening - 1.5/2.0 ml chromatography vials.PP Cap with White PTFE/Biege Silicon Slit Bonded septa reduces the possibility of coring and used to prevent vacuum from forming inside the vial. It provides good balance of performance and usability