This beautiful Cat Aromatherapy pendant with chain includes 8 inserts of different colors, ready for you to add one or two drops of your favorite essential oils or oil blends. For example, many publications and research documents indicate that lavender and clary sage are calming essential oils, while a citrus blend is uplifting and invigorating. There are many essential oils and blends that can help with various emotional feelings such as anger, anxiety, etc. Your own research can help with essential oils, but you are welcome to contact me for oil information and availability. Oils not included. Insert colors may vary from those shown.