A bola is a traditional tool originating in South America. It usually consists of three stone balls attached by cords. Throwing them correctly wraps the cords around the legs of a target, immobilizing it. Cowboys in Argentina and Uruguay have used them capture stray cattle.
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The BolaWrap is a modern-day bola used by police to restrain people without seriously injuring them. The handheld device fires a bola 10 to 25 feet away and locks around the target. Fire it at the legs and the suspect soon finds he can’t walk anywhere.
-via Marginal Revolution