For customers who wish to combine a classic block shape, the anisotropic characteristics of grade 5 alnico, and the intense strength of a u-shaped design, BuyMagnets.com offers a magnet that checks every box. The u-shape design of this magnet concentrates strength between the north and south poles of the grade 5 alnico magnetic material, amplifying the magnetic field and achieving a holding force of 6.5lbs.