2 new replacement magnet kits for the 12-1/4" x 3-3/8" electric trailer brakes, used for most brand 9,000# &10,000# trailer axles in the market. The listing has 2 kits, which are replacement for one axle Each kit includes: 1 x magnet with wire, 1 x coil spring, 1 x magnet retainer clip These magnet kits are from our warehouse stock, which we wholesale to US trailer axle manufactures