This set of Dark Horse Miniatures features 16 total Teenage Mutant Ninja Turtles figures, with 2 duplicates included.  The duplicates are 2 of the turtles with energy weapons.

From Lost Minis Wiki:

In 1984, Dark Horse produced this 25mm Teenage Mutant Ninja Turtles range, under license from Mirage Studios, based on the comics. The license was the first-ever granted by the TMNT creators.