This is a cover specifically designed for the Quad Cortex, made from 2mm thick acrylic. For those who find opening and closing the lid troublesome, we recommend this lidless type in combination with a protective film for the LCD screen. Additionally, a hole is provided for the power button, allowing for smooth on/off operation. A cleaning cloth and transparent double-sided tape that leaves minimal residue are included. 【Inspection and Replacement Policy】 We generally ship the product with the film attached, but occasionally, issues such as laser-induced hazing, which may not be visible through the protective film, can occur. In the unlikely event that a defect is discovered after removing the film, we will replace the item as an initial defect. Please contact us before leaving a review. 【Important Notice】 Since its launch, this product has been a popular choice for many customers. We continue to maintain the highest standards of quality and customer service. Recently, we have identified instances of a seller of similar products using multiple accounts to purchase our product solely for the purpose of leaving negative reviews. These reviews have been identified as malicious by the Mercari administration and have already been removed. We will continue to take strict action against such harassment. We will continue to operate with integrity, so please feel confident in your purchase.