Serene Pod Wax Warmer Refill Cups, 35g, Pack of 2 (Clean Cotton) Prioritizing safety, durability and ecology, the new Serene Pod Warmers are a tribute to simplicity and functionality and are fast becoming icons of a new category of scent diffusers. These fragrant wax bars are embedded in an aluminum cartridge and turn on the device to start diffusing your favorite scent.sealed with a lid, ensuring that the enclosed fragrances are as fresh today as the moment they were extracted. These new cartridges are exceptionally convenient. Simply remove the seal from a Serene Pod, place it in a Serene Pod Warmer a Serene Pods allow for quick and mess free cleanup when you decide to change fragrances. The specially designed perforated film top increases safety by preventing wax spillage. A fragrance that captures that pleasant scent of just-out-of-the-dryer freshness! A blend of peony, magnolia and lily flowers, Clean Cotton is an elegant scent.