Once you have your Aromafier diffuser opened and have removed the vented insert, simply add drops of your choice of essential oil to the absorbing pad. The more oil you add, the stronger the fragrance will be once your device is operating. These diffuser refill pads make it so you can switch the fragrance in your diffuser for many uses of your diffuser. Each pack comes with 6 diffuser refill pads. Order for your diffuser today.