Abstract: A magnetic device is provided, which includes an array of magnet stacks placed on a base plate that has a paramagnetic property. Each stack of one or more magnets is arranged such that the opposite poles of adjacent magnets in the stack face each other and preferably are in contact with each other. The magnet stacks form an M×N array; in each row and each column of the array, the magnet stacks have alternating polarities throughout the row or column. The adjacent stacks in the array are preferably in contact with or in close proximity of each other. A case or holder is also disclosed, which have pocket(s) in which the magnetic device(s) is disposed, for carrying mobile phones or other electronic devices or small items.