This is a custom-designed Keytop Roof (hard cover) made specifically for the HHKB Studio by PFU. It’s built for two purposes: protecting your keyboard when not in use, and providing a sturdy palm rest while typing.
Dual-Purpose Design: Internally reinforced for rigidity so it can comfortably support your palms during use
Protection Tip: To help prevent scratches on your HHKB Studio frame, I highly recommend adding thin felt or rubber padding to the contact areas