Patent ID: 7410118

Claim:
A magnetic tape cartridge reel comprising: a hub having a first end and a second end configured to receive a magnetic tape to be wound thereon, and an inner hole extending between the first end and the second end; at least one flange which is attached to at least one of the first end and the second end of the hub, wherein a diameter of an aperture of the at least one flange is the same as a diameter of the inner hole; and at least one ring portion disposed on an outer surface of the at least one flange so as to be positioned along an outer perimeter of the at least one flange, so that a shape of an outer perimeter of the at least one ring portion is the same as a shape of the outer perimeter of the at least one flange, a diameter of an aperture of the at least one ring portion being larger than the diameter of an aperture of the at least one flange, wherein the at least one ring portion has a greater specific gravity than the at least one flange.