A roller shutter (100, 500, 700, 1100) comprising a rotatable drum having a rotational axis; a shutter curtain comprising a series of three or more elongate slats pivotally interlocked in a longitudinal-edge-to-longitudinal-edge arrangement one after another and arranged parallel to the rotational axis of the rotatable drum in a manner so as to be capable of being wound on and off the rotatable drum together in an interlocked state, each of the elongate slats having a first longitudinal end portion and a second longitudinal end portion, wherein the first and second longitudinal end portions (134, 136) being respectively aligned to form a first side border and a second side border, respectively, of the shutter curtain, and wherein the first longitudinal end portion and the second longitudinal end portion of each elongate slat are respectively provided with at least one eyelet-structure (140, 740) which protrudes therefrom, whereby a first row of eyelet-structures and a second row of eyelet-structures are formed along the first and second side borders (124, 126), respectively, of the shutter curtain; and at least a first cord and a second cord, the first cord being strung loosely through all eyelet-structures of the first row of eyelet-structures and the second cord being strung loosely through all eyelet-structures of the second row of eyelet-structures, and each cord being configured to confine all eyelet-structures of respective row (144, 146) of eyelet-structures within a length of each cord (154, 156), wherein each of the elongate slats comprises at least one elongate reinforcing member extending within said elongate slat in a manner so as to be aligned longitudinally to said elongate slat, wherein the at least one elongate reinforcing member extends across an entire length of said elongate slat, and wherein the at least one eyelet-structure of the first longitudinal end portion of said elongate slat is integrally connected to a first longitudinal end of the at least one reinforcing member and the at least one eyelet-structure of the second longitudinal end portion of said elongate slat is integrally connected to a second longitudinal end of the at least one reinforcing member. a rotatable drum having a rotational axis; a shutter curtain comprising a series of three or more elongate slats pivotally interlocked in a longitudinal-edge-to-longitudinal-edge arrangement one after another and arranged parallel to the rotational axis of the rotatable drum in a manner so as to be capable of being wound on and off the rotatable drum together in an interlocked state, each of the elongate slats having a first longitudinal end portion and a second longitudinal end portion, wherein the first and second longitudinal end portions (134, 136) being respectively aligned to form a first side border and a second side border, respectively, of the shutter curtain, and wherein the first longitudinal end portion and the second longitudinal end portion of each elongate slat are respectively provided with at least one eyelet-structure (140, 740) which protrudes therefrom, whereby a first row of eyelet-structures and a second row of eyelet-structures are formed along the first and second side borders (124, 126), respectively, of the shutter curtain; and at least a first cord and a second cord, the first cord being strung loosely through all eyelet-structures of the first row of eyelet-structures and the second cord being strung loosely through all eyelet-structures of the second row of eyelet-structures, and each cord being configured to confine all eyelet-structures of respective row (144, 146) of eyelet-structures within a length of each cord (154, 156), wherein each of the elongate slats comprises at least one elongate reinforcing member extending within said elongate slat in a manner so as to be aligned longitudinally to said elongate slat, wherein the at least one elongate reinforcing member extends across an entire length of said elongate slat, and wherein the at least one eyelet-structure of the first longitudinal end portion of said elongate slat is integrally connected to a first longitudinal end of the at least one reinforcing member and the at least one eyelet-structure of the second longitudinal end portion of said elongate slat is integrally connected to a second longitudinal end of the at least one reinforcing member.