A braking band of a disc for disc brake of ventilated type, - said braking band extending between an inner diameter, near a rotation axis (X-X) of the braking band, and an outer diameter, far from said rotation axis (X-X), said rotation axis defining an axial direction (X-X); - said braking band defining a radial direction (R-R), substantially orthogonal to said axial direction (X-X), and a circumferential direction (C-C), orthogonal to said axial direction (X-X) and to said radial direction (R-R), and a tangential direction (T-T) punctually orthogonal to said axial direction (X-X) and a radial direction (R-R); - said braking band comprising two mutually facing plates (3, 4); - said plates (3, 4) comprising inner surfaces (5, 6), either directly or indirectly facing and delimiting a gap; - said plates (3, 4) being joined to each other by heat dissipating and connecting elements (16, 17, 19), also named connecting elements; - said connecting elements (16, 17, 19) project from a plate reaching the opposite plate, thereby forming bridges which connect the plates (3, 4) to each other; wherein a first series of fins of said connecting elements is each a fin which is in a single piece and extends from near said inner diameter to near said outer diameter; and wherein each of said fins of said first series of fins comprises a fin outer end portion located near said outer diameter; said fin outer end portion comprising a predetermined extension along the outer circumferential direction, i.e. an outer circumferential width (Lo); each of said fins of said first series of fins comprising a fin inner end portion located near said inner diameter; said fin inner end portion comprising a predetermined extension along the inner circumferential direction, i.e. an inner circumferential width (Li); wherein considering a section taken along a section plane comprising a radial (R-R) and circumferential (C-C) direction, section made by passing through a mean air flow point which runs through said gap, said outer circumferential width (Lo) is greater than said inner circumferential width (Li); characterized in that said fin outer end portion of said each fin of said first series of fins faces only an adjacent fin of said first series of fins on both sides in circumferential direction (C-C), wherein in said section taken along said section plane comprising a radial (R-R) and circumferential (C-C) direction, section made by passing through said mean air flow point which runs through said gap, a section edge or perimeter of each of said fins of said first series of fins has a triangular shape. - said braking band extending between an inner diameter, near a rotation axis (X-X) of the braking band, and an outer diameter, far from said rotation axis (X-X), said rotation axis defining an axial direction (X-X); - said braking band defining a radial direction (R-R), substantially orthogonal to said axial direction (X-X), and a circumferential direction (C-C), orthogonal to said axial direction (X-X) and to said radial direction (R-R), and a tangential direction (T-T) punctually orthogonal to said axial direction (X-X) and a radial direction (R-R); - said braking band comprising two mutually facing plates (3, 4); - said plates (3, 4) comprising inner surfaces (5, 6), either directly or indirectly facing and delimiting a gap; - said plates (3, 4) being joined to each other by heat dissipating and connecting elements (16, 17, 19), also named connecting elements; - said connecting elements (16, 17, 19) project from a plate reaching the opposite plate, thereby forming bridges which connect the plates (3, 4) to each other; a first series of fins of said connecting elements is each a fin which is in a single piece and extends from near said inner diameter to near said outer diameter; and wherein each of said fins of said first series of fins comprises a fin outer end portion located near said outer diameter; said fin outer end portion comprising a predetermined extension along the outer circumferential direction, i.e. an outer circumferential width (Lo); each of said fins of said first series of fins comprising a fin inner end portion located near said inner diameter; said fin inner end portion comprising a predetermined extension along the inner circumferential direction, i.e. an inner circumferential width (Li); wherein considering a section taken along a section plane comprising a radial (R-R) and circumferential (C-C) direction, section made by passing through a mean air flow point which runs through said gap, said outer circumferential width (Lo) is greater than said inner circumferential width (Li); characterized in that said fin outer end portion of said each fin of said first series of fins faces only an adjacent fin of said first series of fins on both sides in circumferential direction (C-C), wherein in said section taken along said section plane comprising a radial (R-R) and circumferential (C-C) direction, section made by passing through said mean air flow point which runs through said gap, a section edge or perimeter of each of said fins of said first series of fins has a triangular shape.