DISCO FRENO AUTOVENTILATO

An internally ventilated brake disk 1, having two friction rings 2, 3, which comprise a first material, preferably a ceramic; and an inner part 6, which is arranged substantially axially between the friction rings 2, 3 and when attached to the friction rings 2, 3, forms air ducts 15, wherein the inner part 6 comprises a second material, preferably steel; the second material differing from the first material. The inner part 6 may be extruded or cast. The inner part may connect to a nave 7 (for attachment of the brake disc to a wheel hub) by connecting elements 12, such as pins, locked in a spring clip (25, fig 3).