Abstract: A device for fastening bags has a length of adhesive tape with a decorative object fixed to one or both ends of the length of tape. The device is produced in series by an apparatus having: actuators for linear and angular feed, a pair of pneumatic pincers, a cutter, a reel to carry the roll of adhesive tape, a stitching device and a dispenser of the decorative pompom. A microprocessor controls the apparatus for cyclical execution of the method wherein: the pincers engage the end of the tape through a cutter and pull the tape for a previously set length to bring it between the stitching device and a first pompom. The cutter then cuts the tape. The pompon is stitched to the non-glued surface and the pincers pull the tape for an equal length so as to bring its other end between the stitching device and a second pompon which is then stitched onto the tape. The pincers rotate and open to expel the finished product.