These small blocks are an interesting size. Unlike many of our block shapes, they are NOT magnetized through their thinnest dimension. They are magnetized through the 1/4" direction. In other words, the north and south poles of this magnet are located on the 1" x 1/8" faces.
Looking for magnets this size with the poles on the big 1" x 1/4" faces? See the BX042
They are incredibly strong for their size and are useful for many applications.