7 Parts of machines, namely, rollers consisting of or coated with synthetic material, fair leads, namely, devices for guiding lines, ropes or cables around an object, support rollers, mangle rollers, diabolo rollers, crane rollers, cable car rollers, cable deflecting rollers, wire guide rollers, conveyor belt rollers, flat link rollers, roller linings, idle rolls, take-down rollers, plain rolls, printing rollers, pulleys, bearing shells, guide bushes, pillow blocks, bearing segments, sliding pads, rail strips, sliding plates, guide strips, guide strips feeders, starter discs, sprockets, steering racks, bevel wheels, worm wheels, chain wheels, dosing wheels, bottle feed devices, screw conveyors, cam rollers, manifolds, centering tulips, support rings, valve seats, stamper plates for compactors, cutting and punching plates, ejector drums, moulds for concrete and ceramics, parts of machines, namely, sealing rings