A flexible sheet comprising a composite sheet, the composite sheet comprising a binder and an aggregate containing a plurality of carbon nanotubes that is disposed in the binder, wherein the aggregate is formed as a waveform structure travelling along a single direction in a plane of the composite sheet, is provided. The disclosed flexible sheets may be used as thermally conductive components, electrically conductive components, antistatic components, electromagnetic wave shields, and/or heating elements, in addition to other possible uses.