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Lined or unlined cryogenic vial closures are designed to successfully preserve biological material for an extended time at extreme temperatures. Caps feature strong construction able to withstand mechanical or vapor-phase freezers. Offered in both exterior and interior locking formats, tops may come with or without O-rings incorporated for additional leak-proof assurance. For easy aseptic techniques in the laboratory, choose from multi-colored cryogenic vial closures that have writable surfaces for quick identification.