Here are the stats for the bolas and barbed bolas, from Dragon #275 ("The Right Tool for the Job," by Andy Collins):
Bolas: small, exotic, 10 gp, 1d6*/x2 crit, range inc. 10, 3 lbs., bludgeoning
Takes a ranged touch attack to hit, target makes a REF save (DC = attack roll); failure means he takes subdual dmg. and is pinned; success means he takes normal damage and is not pinned. Breaking free requires: STR check, DC 20, or Escape Artist, DC 20, or cut out (5 hp to the bolas from a slashing weapon) - and is always a full-round action, with taking 10 or 20 allowed.
Bolas, Barbed: small, exotic, 20 gp, 1d6/x2 crit, range inc. 10, 4 lbs., piercing
Identical to bolas except always deals normal damage, and failed attempts to break or wriggle free deal 1d4 dmg. to the escaping char.
I think that covers it.
