WAYYYYY too thick. I stripped out my pickup screw mounting holes trying to install a pickup with this foam on the back. They are about half again as thick as they should be, and that creates too much tension/up force for the little screws to hold in the wood. Now I have to do the toothpick trick to all 4 of my screw holes to add wood to them so I can try again with different foam. Complete waste of time and money. Buy the ones you can get on eBay that have the springs embedded in them instead. They work WAY better.