These replacement fragrances are to be used only with the PURA device. Yuzu citron is Energizing Japanese yuzu citrus, mixed fruits, and a colorful blend of florals create a scent with a refreshing citrus punch. Pura fragrances are thoughtfully designed to never include harsh chemicals. We avoid ingredients known to cause potential harm to health or the environment. Every fragrance is safe and ethically sourced. I have a total of four yuzu citron refills. this listing is for all four