5LB BLACK SAND Pocket Magnet Separator Pen Gold Pan Mining Panning Prospecting The SE PM6549 Prospector's Choice 5 lb. Magnetic Black Sand Pocket Separator Pen is water resistant and great for prospecting, as it picks up black sand without picking up gold and other precious metals if you do not overload it. The diameter of the magnetic base is 11/16" and the height is 53/8".SE is