Cryogenic Vials with External ThreadsCryogenic Vials with External Threads Innovation for the long term protection of your precious samples. You've spent days, months, even years getting your labor of love to this point . . . don't risk losing your precious samples to something as simple as a problematic o ring! Globe Scientific CryoClear vials feature an innovative polyethylene (PE) screw cap that is co molded with a layer of thermoplastic elastomer (TPE). This special manufacturing