Other — Permanent magnets of an alloy of neodymium, either in the shape of a rectangle, whether or not rounded, whether or not coated or passivated with a surface treatment, with: -a rectangular or a trapezoidal cross-section, -a length of not more than 140 mm, -a width of not more than 90 mm and -a thickness of not more than 55 mm, or in the shape of an arched rectangle with: -a length of not more than 75 mm, -a width of not more than 40 mm, -a thickness of not more than 7 mm and -a radius of curvature of more than 86 mm but not more than 241 mm, -layers of nickel and copper or in the shape of a disc with: -a diameter of not more than 90 mm, -whether or not a hole in the centre