Each box comes with 3 gm of amber resin inside! The box has carved openings in it, so the fragrance can permeate the air in the room, car, what have you.
When you run out of amber resin, you can replace it with amber resin refills!
Amber has a harmonizing effect on the etheric body. Many people have told me it gives them a sort of "Happy Buzz", when they smell it.
Box styles may vary, somewhat. All have a perforated top, but the pattern of the holes may vary, from box to box. Most boxes will have decorative brass plates at each end, as well. Boxes are 1.5" long.