Aijiren produces 2ml autosampler vial with closures, Cap specifications are 9mm screw neck, 0mm screw neck, mm snap neck, mm crimp neck, 3mm screw neck, all made of high-quality polypropylene, with or without center hole type. Septa is a unified PTFE and Silicone compounded using a binder-free method. This Septa has a softer texture and is convenient for autosampler puncture.