Magcraft Magnets used for the AF designed covers:
Rare-Earth Disc Magnets, 0.375 in. Diameter x 0.125 in. Thick, 30-Count (AF CLeg 4 Cover)
Rare-Earth Disc Magnets, 0.375 in. Diameter x 0.25 in. Thick, 12-Count (AF Custom BK Covers)