The Bali-Song ('Butterfly knife') is a design of folding knife with the handle in two parts, hinged separately at the blade. When closed, the blade is completely enclosed by the handles, allowing a double-edged blade to be safely employed in a folding knife, when open the handles clip together, forming a knife almost as strong as a fixed blade. Research Bali-Song
 
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert