Embodiments of a dispensing system for dispensing a number of products to a user are disclosed. The second gate dielectric comprises a different material than the first gate dielectric. One of the leg portions preferably has an annular flange offset from its sealing plane in an axial direction towards the sealing plane of the other leg portion. The composition contains i) a salt of one or more of myristic, palmitic and stearic acid; and preferably also ii) a C9-C18 fatty acid complex of a metal ion, the metal ion having an oxidation state of at least 3.