These professional-grade isolation pads are excellent under electronics as well, which is how I use them. However, I have too many spares, so am letting this pair go.
Used but in very good condition. See the pics.
Each pad is 19" x 13" x 2.125".
No foam wedges.
Now just $100 (firm).
I also have a set of the smaller, non-XL ProPads for sale. See my other listings.