Ninja Master is an older reactive ball with a core very similar to the white XS ball A.M.F. had out several years back.

  The Bobcat is a cheapish urethane cover over a 3 piece pancake weightblock.

   Of these two balls, the Ninja Master is, by FAR, the better of the two balls due to the reactive cover and the dynamic weightblock.  The urethane cover and the 3 pice weightblock in the Bobcat would make it good for spares and REALLY dry lanes only in todays modern game.
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