Set your Scent Scene™ alive with Scent Stems™, a pure fragrance liquidless diffuser for a unique experience that's exhilaratingly potent. An innovative (and incredibly potent) liquidless diffuser. Kyoto in Bloom and Lost in Amalfi - Camellia & Lotus and Sea Mist. To use, place your Scent Stems™ of choice into the metal vessel, ensuring it's placed on a flat surface away from open windows or vents. After 30 days, or a time of your choosing, swap out the Scent Stems™ for the other supplied fragrance. Replacement Scent Stems™ are sold separately, with seven fragrances to choose from. We suggest replacing your Scent Stems™ every 30 days to refresh your fragrance or to increase their strength. After 30 days the Scent Stems™ can be placed in recycling with other paper products.