The Persuader key holder is probably the most popular weapon of opportunity of modern times.  Originally called the Yawara, then the Kubotan, and now the Persuader,  it is an excellent weapon for men, women, and children, if the basics are mastered.  There are many fancy techniques using the Persuader, but this DVD concentrates on the moves that really count in self defense, the basics.  Professor George Sylvain, a former police officer, teaches how to use the weapon of opportunity, in easy concise steps which all can follow.  Plus he talks about survival in the streets of a major city.