A ribbon for manufacturing a honeycomb structure, a honeycomb structure and a method of manufacturing a curved honeycomb structure having a plurality of honeycomb cells, a curved geometry and an inner and outer surface with minimal forming. The ribbon comprises a continuous series of foldable sections arranged in sequence along the length of the ribbon, and top and bottom edges curved along the length of the ribbon when the ribbon is in a flat, unfolded state. Each section may have a top edge and a bottom edge, at least one top edge or bottom edge of at least one section in said continuous series of foldable sections being curved to conform to said curved geometry of said honeycomb structure.