9 mm wide-mouth threaded PP HPLC vials: 9 mm screw caps, septa, and vials are designed for use with Aijiren and other rotary or robotic samplers. 12X32 mm vials are made of polypropylene with internal The micro-storage inner tank, this micro-groove can increase the storage level, and facilitate the sample to draw liquid from the automatic injection needle inside the Vias. These are the advantages of the micro vial compared to the ordinary automatic injection vial.