This is a keyboard bridge that's convenient when using an HHKB in the "Sonshi style" (a specific way of using the keyboard). The quality and usability have significantly improved compared to previous models. The product costs 5,280 yen (including tax). I used it with an HHKB Professional Hybrid Type-S and an HHKB Studio placed on a Dell Precision 5560 (as shown in the photos). I've only used it a few times, so it's in good condition. There are no accessories such as the box or instruction manual. *The PC itself and the HHKB keyboard shown in the photos are not included. ~~~~ The following is quoted from the manufacturer's website ~~~~ This product is a keyboard bridge® (keyboard cover) that is the perfect size for MacBooks and MacBook Pros. The liquid crystal side is raised to create a gap for heat dissipation. A keyboard bridge is, as the name suggests, a "bridge for keyboards." By placing (putting) the keyboard bridge over the keyboard of a laptop, you can protect the laptop's keyboard from dust, the impact of falling objects, or animals such as cats. Another advantage of using a keyboard bridge is that you can place your favorite keyboard in the original keyboard position of your laptop and operate the laptop. When working on a MacBook or MacBook Pro, by using this product, you can place your favorite keyboard, such as PFU's Happy Hacking Keyboard (HHKB), in the original keyboard position of your MacBook and work comfortably. ＜Specifications＞ Compatible Models: MacBook, MacBook Pro (and other laptops with compatible sizes and specifications *1) Compatible Keyboards: PFU Happy Hacking Keyboard series Material: Polycarbonate Colors: Freezer (CM), Smoke Black (BM) Dimensions: 130 x 305 x 4-8.5mm Weight: Approximately 135g JAN: 4539113108243 (BRG-BM), 4539113108304 (BRG-CM) *1 ThinkPad X1 series tested