The copper club seemed to be at most 0.5-1 centimeter thick.  The geometry of the case made it hard to see the shape of that piece.   
 
I was also interested in seeing the teeth on those clubs.  So far as I can tell, those teeth are there to concentrate the force of the attack on the tips of the teeth, rather than to cut per se.  I suspect that the shark teeth on the Kiribatian weapons are there for similar reasons. 
 
Best, 
 
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