Profile: China Magnets Source Material Limited is a manufacturer of custom permanent magnet. Our permanent magnetic dipole is a high field of magnet assembly, a magnetic lab device for physical research projects. It consists of a pair of permanent magnets across a gap. The magnets are usually mounted on a steel frame (also called a yoke) for magnetic efficiency, magnetic shielding and/or mechanical strength. Permanent magnet based dipole magnets require no current to provide a constant field. No large power supplies are required, and no current-carrying cables, and there is a less risk of power supply failure.