Abstract: The present invention is a device to magnetically treat beverages by fastening to a beverage container. The present invention is preferably a magnetic fastener constructed and arranged to be attached to the neck of a wine bottle. The magnetic fastener comprises two semi-cylindrical halves, a spring mechanism connecting the semi-cylindrical halves and a plurality of magnets. Each semi-cylindrical half may preferably have a fastening end and a grasping end, wherein each fastening end may contain three columns of magnets which may preferably be substantially evenly spaced in the fastening end of the semi-cylindrical half. The magnets may preferably be aligned so that the polarity runs through the device, wherein the north pole is located at one end and south pole is located at the other end.