Currently, the N52 magnets used in MDRS tools are the state of the art. The patent for Rare Earth N52 magnets is actually held by General Motors. During MDRS research and development, we experimented with many sizes and configurations of magnets. We found that stacking two 2" magnets on top of each other provided no greater dent removal capacity than simply altering the handle set up. We also ordered a 3" x 3" N52 magnet and made a tool with it. This tool delivered no greater dent removal ability that a 2" N52, but was very cumbersome, heavy and ergonomically unfeasible.