The WT60-D WEIRDFLEX PCB is supported by silicon rubber standoffs attached to FR4 (fiberglass) leaf springs mounted to the case. Foam pads underneath the leaf springs provide vibration dampening and force modulation. The leaf springs provide exceptional flexibility, allowing the entire plate/PCB subassembly to yield under keystrokes and vibrate in isolation from the case. The result is a typing experience that is soft and vibrant across the whole keyboard.
The SALVATION is designed for customization and experimentation. Build it with the stock FR4 plate, or use third-party 60% plates made of metal or plastic. Build it half-plate or plateless. Tweak the foam pad placement to make the leaf springs more or less flexible. Modify the stock FR4 plate to have slots that match the WT60-D WEIRDFLEX PCB, or into a half-plate design. Make your own leaf springs out of other materials.