A combustor panel (126, 128) for use in a gas turbine engine comprising: a panel body having a first side and a second side; a plurality of cooling pins (140; 240; 340; 440) extending from the first side, the plurality of cooling pins arranged in a pin array configuration, wherein each cooling pin extends a first height (H 1) from the first side of the panel body, has a pin diameter (β), and is separated from adjacent cooling pins of the pin array by a pin array separation distance (α); at least one structural protrusion (144; 244; 344; 444; 544) extending from the first side of the panel body, wherein no cooling pins of the pin array are located at a position within a flashing distance (μ) that is equal to a protrusion separation distance (γ) plus one half of the pin diameter, wherein the protrusion separation distance is a predetermined minimum distance between an exterior surface of the at least one structural protrusion and an exterior surface of a cooling pin, and wherein a location of the cooling pin is measured from a center point of the cooling pin to a closest point on the exterior surface of the at least one structural protrusion wherein the flashing distance is a distance at which flashing may occur during a casting manufacturing process; and characterised in that the combustor panel further comprises a plurality of pin array extensions integrally formed with the at least one structural protrusion, wherein the pin array extensions are radial extensions of material of the at least one structural protrusion that extend, in an intermittent fashion around the at least one structural protrusion, radially from the exterior surface of the at least one structural protrusion to positions that replace cooling pins of the pin array configuration that would have been within the flashing distance, the pin array extensions thereby mimicking the pin array configuration in zones where flashing may have occurred, wherein the pin array extensions are shaped and sized such that no portion of the pin array extensions are closer to an adjacent cooling pin than the pin array separation distance. a panel body having a first side and a second side; a plurality of cooling pins (140; 240; 340; 440) extending from the first side, the plurality of cooling pins arranged in a pin array configuration, wherein each cooling pin extends a first height (H 1) from the first side of the panel body, has a pin diameter (β), and is separated from adjacent cooling pins of the pin array by a pin array separation distance (α); at least one structural protrusion (144; 244; 344; 444; 544) extending from the first side of the panel body, wherein no cooling pins of the pin array are located at a position within a flashing distance (μ) that is equal to a protrusion separation distance (γ) plus one half of the pin diameter, wherein the protrusion separation distance is a predetermined minimum distance between an exterior surface of the at least one structural protrusion and an exterior surface of a cooling pin, and wherein a location of the cooling pin is measured from a center point of the cooling pin to a closest point on the exterior surface of the at least one structural protrusion wherein the flashing distance is a distance at which flashing may occur during a casting manufacturing process; and characterised in that the combustor panel further comprises a plurality of pin array extensions integrally formed with the at least one structural protrusion, wherein the pin array extensions are radial extensions of material of the at least one structural protrusion that extend, in an intermittent fashion around the at least one structural protrusion, radially from the exterior surface of the at least one structural protrusion to positions that replace cooling pins of the pin array configuration that would have been within the flashing distance, the pin array extensions thereby mimicking the pin array configuration in zones where flashing may have occurred, wherein the pin array extensions are shaped and sized such that no portion of the pin array extensions are closer to an adjacent cooling pin than the pin array separation distance.