Round sauna serving tray: a practical bowl designed for sauna use, ideal for aromatherapy and essential oils as an oil dish. Stainless mixing bowls: constructed from stainless steel and wood materials, safe and healthy to use, suitable for holding oils and compatible with scent oil diffusers. Porcelain bowl: made from quality materials to minimize health concerns, ideal for aroma oils and essential oils without worry of harmful substances. Metal aroma holder: features a swing arm to position the sauna bowl over a sauna stone or heater; swing as needed to control aroma diffusion and serve as an essential oil holder. Use scenarios - In sauna: attach the metal aroma holder to a suitable point and place the sauna bowl over the heater or stone; swing to release fragrance during the session. - In spa or home: use the porcelain or stainless/wood bowls to hold essential oils on a table or around a diffuser area for steady fragrance. - For oil blends: use the stainless steel/wood bowls to mix and transfer essential oil blends before diffusing or applying.