Each pad is 8" x 13" x 2.125" (w/o wedge) and 8" x 13" x 3.125" (w/wedge).
These professional-grade isolation pads are excellent under shoebox-size electronics as well, which is how I use them. i.e. Naim UnitiQute/Atom/HiCap, Heed Obelisk DT, HDPlex LPSU, etc, However, I have too many spares, so am letting this pair go.
Used but in very good condition. See the pics.
I also have a set of ProPad XLs for sale. See my other listings.