Effectively Prevents Dust: The universal keyboard cover is designed for standard-sized desktop keyboards. It effectively prevents water and other spills from penetrating, keeping your keyboard surface clean. Durable Material: Made from high-quality silicone, the keyboard dust cover is soft, comfortable, and won't damage your computer. It's environmentally friendly, durable, and has a long lifespan. Easy to Use: The ultra-thin, transparent design of the computer keyboard cover allows letters to be clearly visible even when applied. It doesn't affect normal typing or other usage. Perfect Fit: The waterproof keyboard cover is expertly designed to fit perfectly without being too large or too small, ensuring it stays in place. Satisfactory Packaging: Receive 4 silicone keyboard covers measuring 44.5 x 13 cm. This quantity is sufficient for replacing old or dirty keyboard membranes.