The frozen flowers are real flowers that have undergone a frosting process to retain its natural and exquisite form.
They will bloom in a dry and cold environment, and close when it is moist and warm.
Generally, frozen flowers can survive independently with little air humidity for at least ten years. No watering required.
In the Eternity series, two tiny holes are present along the groove line of the top bullet piece - they help to provide air flow for the flower, and hence, allowing the flower to react accordingly to the atmosphere.
This is so beautiful.