Libra Two 12-1/4"x3-3/8 Electric Trailer Brake Magnet Replacement Kits for 10K axle - 21026 2 new replacement manget kits for 12-1/4"x3-3/8" electric trailer brakes works with most 9,000-10,000 lbs trailer axles in the market Includes: 2 Magnets with wire, 2 coil springs,2 retainer clips