The one pictured is a 14x12
The Green and Amber kits has 14x10
The Stainless steel kit had 15x12
I had heard this several times, but here is the only solid "proof" I have.
This kit is identical in sizes to Carmine Appice's drum set that he was using at the same time, and he has said it was 14 not a 15, that too is about as good as verification gets.