aijiren Techbrand™ 9mm Short Thread Vial Kit, PP, Clear, 1.5mL, PP Screw Cap, Center Hole, Silicone/PTFE Septum. Includes 100 vials and 100 caps with pre-assembled septa. aijiren Techbrand™ 15mm PP Screw Cap, Black, 15-425 thread. Polypropylene caps are chemically inert and suitable for most chromatography applications.