Car Electric Suction Cup Magnetic Phone HolderFEATURES N52 NEODYMIUM MAGNETIC PHONE HOLDER Neodymium is the strongest and most magnetically stable rare earth magnet material, and N52 is the highest grade of neodymium, therefore, N52 magnets are the highest quality magnets available in the industry. For example, N35, N42, and N52 denote the strength or energy product of the magnet grade, and the larger the number with the grade, the greater the energy product of the magnet. This is by far the best