Unless they’ve changed it, they’re not really type-high- I ordered some and they are the standard mounted grey stuff- about 3/4 inch high. Dick Blick also advertised type-high blocks, which were the same 3/4 inch, and I called and expressed my extreme disappointment with their advertising. So, if you’ve ordered them, measure! And, if they really are type-high, let me know so I can get some too 😉
If you’re working on wood art-boards.com sells plank and end-grain maple boards that are absolutely 100% type-high.