1. A peening tool comprising: at least one first roller having a peening surface disposed about and along a first core, wherein at least a portion of the at least one first roller is configured to contact a component to be peened along a length, said length extending along at least a portion of the first core, the at least one first roller configured to provide line contact on the component along the length, wherein a profile of the at least one first roller is determined based on a profile of the component; and a backer disposed in register with the at least one first roller such that the at least one first roller moves with the backer during peening, wherein the at least one first roller and the backer are configured to be arranged on opposing surfaces of the component; wherein the backer is at least one second roller disposed about and along a second core, the at least one second roller in register with the at least one first roller such that the at least one first roller moves with the at least one second roller during peening, wherein the at least one first roller and the at least one second roller are configured to be arranged on opposing surfaces of the component; wherein the at least one first roller and the at least one second roller are independently removable from the first core and second core, respectively.