Cock Ring takes stone needle as raw material (natural rare mineral stone), according to body engineering. We have developed the following sizes on the base of different sizes of male reproductive organ :24mm,26mm,28mm,30mm,32mm,34mm,( ring¡¯s inner diameter) . The inner circle what looks like tiger head has three round and flat grooves, the upper two small ones look like tiger ears, the lower(bigger than the upper) one looks like tiger chin. When using Cock Ring, the ¡°tiger ears¡± will be separately next to male reproductive organ¡¯s artery and vein. ¡° tiger chin ¡± will be next to male reproductive organ¡¯s sperm duct. The front totem is the traditional lucky picture of Taoist.