The water-resistant Wartmann Sous Vide Magnet Set - 8 Pieces is specifically designed for sous vide cooking. The magnets ensure that the vacuum bags stay submerged, for example in the sous vide water bath or the pan. By placing the magnets on the outside of the container and on the vacuum bag, the magnets do not come into contact with the vacuum-sealed food. The Wartmann Sous Vide Magnet Set - 8 Pieces is made of high-quality material and therefore has a long lifespan.