You can hit each other endlessly with Boffers and it never hurts, but it does make a very loud, cracking sound (known as a boff). It’s a safe way to vent your hostility, with shades of Errol Flynn.
Sword-play games, from Three Musketeers to Star Wars, are what Boffers are all about. They are not for clubbing, but for dueling and also swatting (as in Swat Tag).
Boffers are white styrofoam swords. They come in a set containing two swords and two eye-and-ear guards.