Stock magnets have about 1.5 oz of downforce. These Grade 52 Neodymium composite traction mags have approximately 4 oz of downforce. These will keep a car on track much better than stock mags. Each pair is north south oriented. Fits all Tyco Mattel magnum 440x2 style chassis. You may need an upgraded motor or 22 volt power supply to run these. See my other auctions for grade 42 magnets.