Posted By:
RichardJosh did a good job explaining the graded slab pages. 4 slabs per page. Pages are made from somewhat rigid plastic and Ultrapro makes them for BGS and PSA slabs. The GAI holders can fit into PSA slab pages, but they are a very tight fit and need to be forced in/out.
In the largest binder that MJ Roop used to offer (I think 4") you can fit 6 slab pages which is 24 slabs.
The only other binders that I have ever found that can fit slab pages are the Ultrapro binders shown above. I do not believe that they offer them anymore.