Polypropylene. 9582S-03-B 100/pack 9582S-03-B-M 1,000/case Caps, black, for 8-425 thread vials. Fitted pre-slit w/Silicone/PTFE septa for Shimadzu™ and others. Polypropylene. 100/pack 9582S-20C-K-M 1,000/case Caps for 8-425 thread vials. Fitted w PTFE/Silicone/PTFE septa in a black cap. Polypropylene. 9582S-02N 100/pack Inserts, 5x29mm