a roller for a fibre - processing machine , for example a spinning preparation machine such as a flat card , cleaner or the like , flock feeder , roller card , nonwoven - forming machine or the like , comprises a roller body . in order to make possible , by simple means , economical manufacture and adequate dimensional stability , for example a substantially constant carding nip , the roller body has at least one metal cylinder and at least one circular cylindrical sheath of fibre - reinforced plastics material surrounding the cylinder .