These foams are designed to fit the Planck - the original ortholinear keyboard by Jack Humbert of OLKB.com
Shipped fast; like warp speed fast.
The foam bring the planck to the next level. Plus the packaging material was a nice treat.
This made so much of a difference for my planck.... do yourself a favor and get it
It definitely does dampen the sound, but it is more about the feel of your keyboard coming a bit closer to completion.
Great reading material included
Nice stickers included