A refillable assembly for dispensing cosmetic product, including a base and a cartridge selectively connectable with the base. The base includes a cartridge receiving element and a cartridge locking element. The locking element is movable relative to the receiving element at least in rotation about the longitudinal axis in a first direction towards an open position and in a second direction towards a closed position. In the open position, the cartridge is movable relative to the base along the longitudinal axis; in the closed position when the cartridge is inserted into the base the cartridge is integral with the base along the longitudinal axis.