Oliver Rich Aroma is made from natural barks of trees & flowers, with 18 different scents..(sandalwood,apple,eucalyptus,geranium, greentea,lavender,citronella,lemon, stress relief,concentration...etc) this product has been approved by the European Standard Authority Board and the Singaporean Standard board for consumable products. 12 units of diffuser in 1 box. Oil-24 bottles in 1 box.(250ml bottle) Price of Oil is USD$40/bottle.