High grade. The doubleshell keyboard feels good. The keyboard has a carbon fiber textured upper cover. It has a smooth surface and focuses on the look and feel. It has high functional configurations, reasonable interface positions, easy installation and disassembly, and is of high quality. Double Shell is a registered trademark of Zhuhai Hengyu New Technology Co., Ltd., which focuses on the research, development and sales of mechanical keyboards and hygienic keyboards.