“…The Cutler ring implant (Cutler, 1947), of which a limited number has been used in Great Britain, has been followed by the " universal " type, a plastic ball of which the anterior convex surface is covered with a fine mesh of tantalum wire (Cutler, 1949). There is now in use in Great Britain an all-tantalum implant, in which the solid plastic ball has been replaced by a hollow tantalum shell.…”