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) comprising a plate body (12, 13) having a predetermined extension in axial direction (X-X) or predetermined plate thickness (14, 15); - said plates (3, 4) being joined to each other by heat dissipating and connecting elements (16, 17, 18), also named connecting elements; - said connecting elements (16, 17, 18) being shaped as columns and/or ribs and/or fins which project from a plate towards the opposite plate, whereby forming bridges which connect the plates (3, 4) to each other; wherein - wherein one of the plates (3; 4) comprises at least one ridge (20, 21) which projects from said plate (3; 4) into said gap without reaching the opposite plate (4; 3), whereby forming at least one localized narrowing of said gap and a thickening of the plate body (12; 13), whereby creating a localized increase of said plate thickness (14; 15); characterized in that: - said at least one ridge (20, 21) remains separated from each connecting element (16, 17, 18), wherein the thickness of at least one plate (3; 4) about said at least one ridge (20, 21) is substantially equal to said predetermined plate thickness (14, 15); and - said at least one ridge extends forming at least two separate ridge branches (31, 32). - 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) comprising a plate body (12, 13) having a predetermined extension in axial direction (X-X) or predetermined plate thickness (14, 15); - said plates (3, 4) being joined to each other by heat dissipating and connecting elements (16, 17, 18), also named connecting elements; - said connecting elements (16, 17, 18) being shaped as columns and/or ribs and/or fins which project from a plate towards the opposite plate, whereby forming bridges which connect the plates (3, 4) to each other; wherein - wherein one of the plates (3; 4) comprises at least one ridge (20, 21) which projects from said plate (3; 4) into said gap without reaching the opposite plate (4; 3), whereby forming at least one localized narrowing of said gap and a thickening of the plate body (12; 13), whereby creating a localized increase of said plate thickness (14; 15); characterized in that: - said at least one ridge (20, 21) remains separated from each connecting element (16, 17, 18), wherein the thickness of at least one plate (3; 4) about said at least one ridge (20, 21) is substantially equal to said predetermined plate thickness (14, 15); and - said at least one ridge extends forming at least two separate ridge branches (31, 32).