A brake band (2) is in a first material suitable for the braking action and has at least one extension (8) for coupling to a bell (3), suitable for coupling the disc (1) to a hub of a vehicle; said coupling extension being a single piece with said brake band and forming a geometric coupling with said bell to transmit the braking action; said geometric coupling being obtained by fusion preferably of the bell on the brake band, said bell being in a second material, the first and second material having a different melting point; said geometric coupling having, circumferentially spaced, first teeth, that axially extend to be tightly received in first axial seats (11) of the bell; wherein said geometric coupling has circumferentially spaced eighth teeth of the band that radially extend circumferentially offset with respect to said first axial teeth (10) and are suitable for being tightly received in eighth radial seats (13) present in the bell.