This spa series is hand made in Sweden of natural raw materials and in most cases organic. The numbers on the lights is a description of the glorious scents lights are available in. Scent 1-4 consists of essential oils. Scent 5-0 is a mix of essential oils and fragrance oils. The lights filled by hand in a brown glass jar with black lid. Light is also a stylish interior decor and have a burning time of about 30h.