Electroforming is a way of making very accurate metal parts.It is similar to electroplating in that a metal coating is deposited on a special form in an electrolytic solution. the difference is that the form can be removed to leave a solid part. this process allows manufacturers to 'grow' components in metals such as nickel.
Electroforming is ideal for very fine components with precise dimensions. It it possible to produce extremely accurate copies of masters.For this reason,electroforming is used in the manufacture of CDs.