100ml Ruby Ruby Ruby scented diffuser in a hand painted glass bottle with a vegan friendly base. These will last 3-6 months depending on their location and the time of year. For optimum scent throw, place at head height and in a small room or entryway. If placed in a medium or large room, it is preferable to place in the centre of the room or to have two at either end so that when people pass by, the air moves and the fragrance circulates.