The delivery took a relatively long time because the items by air mail came from abroad. Once I opened the package came out a bestial, acrid stench. The sponges smelled extremely Chemicals or other pollutants !? Aired several days and nothing has since unfortunately brought. The intensity of the smell has not diminished. What materials were used here is not clear to me, in any case can such a thing be just harmful. If I could give 0 stars, that would have been my vote. Stay away from this article!