These huge P125D4000 neodymium magnets *MUST* be handled with extreme caution. These giant permanent magnet blocks are favorites of magicians and illusionists. They are incredibly powerful and should only be purchased by users familiar with the proper handling of large neodymium magnets.
Two of these permanent magnets stuck together are virtually impossible to separate by hand. They can pinch and cause physical harm if they are not handled with care and respect.