The kestros is an oddly shaped sling used for launching darts.
Benefit: Your Strength modifier applies on damage rolls when you use a kestros, just as it does for thrown weapons. You can fire—but not load—a kestros with one hand. Loading a kestros is a move action that requires two hands and provokes attacks of opportunity. Halflings treat the kestros as a martial weapon.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.