hybrid tool for curing composite parts

hybrid tool (14) for curing composite parts, comprising at least a metal portion (15, 15 ') and an elastic portion (16, 16') disposed on a surface of the metal portion (15, 15 '), wherein the elastic portion (16, 16 ') and the metal portion (15, 15') are permanently connected together, and wherein the metal portion and the elastic joint portion defining a contact surface (17, 17 ' ) having a shape copying at least part of a surface of a piece (25) composite material cure, characterized in that the elastic portion (16, 16 ') having an inner end (19) located in an inner region the metal portion (15, 15 ') and an outer end (20) located near a distal end of the metal portion (15, 15'), and wherein the thickness of the elastic portion (16, 16 ') increases progressively from the inner end (19) to the outer end (20).