Bowlingkid25, I can't say what core is used, but I checked with Ebonite, and they use a different core in the 13# V2 Sanded than what's in the 14#er, according to Mr Hickland's section, anyway.
I got my wife a 13#er, due to her wrist last year, we never drilled it, but I asked about the core, as Storm, Columbia both use different ones in "light" balls and I wondered. I was told it is a 'lighter core' so, I was told the filler is filler, can't be changed in weight. All I know is what Ebonite told me, I have yet to cut one open to see, not sure I want to , but I do think that's the only way one will ever know.
Again, we all have our opinions, I was only basing mine off what I was told by Ebonite.
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AZ Guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.comSleep is over rated.