Innovative Single-Key Slotted PCB&Five-Layer Sound-Shock AbsorptionEquipped with a unique single-key slotted PCB made of high-quality FR4 material, the F99 offers smooth typing feedback. Each key is independently slotted, enhancing the crispness and accuracy of keystrokes. The F99 features a five-layer design, incorporating IXPE under-shaft pads, PORON sound-absorbing cotton, and silicone bottom padding. This configuration ensures ultra-comfortable typing with reduced sound and shock.