The capillaries are kept in a gas-tight Mylar bag, and both ends are protected with a Teflon cap held in place with polyimide tape to protect them during storage.
Each bag contains a coiled nano-electrospray emitter (sharp tip silica capillary, 20 ┬Ám ID, polyimide-coated) specifically engineered for the SUPER SESI ion source. These capillaries are extremely sharp and thin, and they might get easily contaminated or clogged if interfered with or in the presence of aerosols.