Features: Brand new and high quality Eliminates cavity sound, increases sound thickness, and reduces keyboard resonance. 3.5mm suitable thickness for installation between the PCB and steel plate; the steel plate and PCB are used for clamping, no glue is required, and the light position is not affected. It fills the entire keyboard, making the sound thicker, eliminating plastic keyboard resonance and cavity sound. This switch silencer sheet, placed between the keyboard's circuit board (PCB) and the positioning plate, is a must-have for keyboard enthusiasts to DIY their keyboards. These keyboard foam dampeners are made of soft foam sponge material, offering high-efficiency noise reduction and won't damage your PCB board. Specifications: Material: Foam Sponge Quantity: 2 PCS Size: 6840: Approx. 28x9.4cm / 11.02x3.7 inches 8037: Approx. 28.5x9.4cm / 11.22x3.7 inches AK: Approx. 28.4x9.4cm / 11.18x3.7 inches (Optional) Color: Black Thickness: 3.5mm Suitable for: 61-layout mechanical keyboard Note: Please allow for slight errors due to manual measurement. Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Package Includes: 2pcs x Switch Silencer