Flexible magnets are compounds of plastics or rubbers combined with magnetic powders of strontium ferrite and are processed by the calendering or extrusion method to produce either sheets or coils by the roll. The finished product is a light weight, corrosion resistant, elastic and stable material available in rolls, sheets, tapes, strips or cut pieces (self-adhesive, white, plain brown or with PVC color coatings) which have a multitude of practical uses, not least within the printing and advertising industries.