Digital BW, The Print

I think I asked this question before.  Does anyone know any difference, 
besides thickness and cut sheet sizes available, between Epson Premium 
Semigloss and Epson Pro Semigloss?

I have been to the Wilhelm site and Epson's site and, although I may be 
missing something, I can't find the answer.

Thank you.

Nancy

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roger" 
<rsmith02@...> wrote:
>
> Thanks Paul, you're right about the semigloss not having brighteners-