More info from their site:
The Subtle Safety™ Defensive Ring (patent pending)
Some 1.9 million women are physically assaulted annually in the United States, and 15 percent to 25 percent of all American women will report a sexual attack or rape at some time in their lives, according to studies conducted by the Justice Department and Centers for Disease Control and Prevention. - August 15, 2004 ABC NEWS
The Subtle Safetyï¿½ line of jewelry is a reminder to make safe choices. The Subtle Safetyï¿½ ring is a expression of confidence. Orange whistles are garish and weapons can easily be turned against you. Subtle Safety jewelry is worn and available right where you need it.