Sir Leisurely: To make sure that the cache container remains securely attached at its location, I use neodymium magnets. These are one of the strongest type of permanent magnet made, and certainly do not “lose their magnetism” within one month of being placed. This is the third time that this highly unusual phenomenon has occurred here on the border of Ince and Elton. There is always an explanation to why things like this happen. Last time I visited the cache site I was amazed to see that not only had the magnet lost its magnetism, but the magnet its self had vanished! The insulation tape that secured it to the container had some how ripped its self apart allowing the magnet to “escape”. I do have quite a few of these magnets but feel that replacing this one each time will only mean that I have fewer for other cache hides. I now archive this cache.