Simply place it in front of the HHKB Studio series to improve the height and lower hand tolerance between your keyboard and your hand in a more optimal manner. Attach the included non-slip rubber soles to the bottom. In addition, the rubber sole uses microcellupolymer material so that it does not leave marks on your desktop, so you can use it with confidence. Specifications: Size: 3.1 x 11.8 x 0.4 inches (80 x 302 x 9 mm) (main unit only). When wearing rubber sole; Thickness: 0.4 inch (10.5 mm); Weight: Approx. 5.6 oz (160 g) (*Because natural wood, the weight may vary depending on the individual product. Material: Plywood (integrated plywood), microcellupolymer (rubber sole); Accessories: 2 rubber soles (0.06 inch (1.5 mm) thick); Note: This product is made of natural material that has been processed and the wood grain may vary depending on the individual product. There may be stains on the material. ·It is sufficient to clean with a soft cloth, but if the dirt becomes noticeable please dilute the neutral detergent using a mild detergent.