High quality PVC mesh, extremely durable and can be washed with water and soap if it becomes dirty over time. Easy to install and remove. It can be easily placed anywhere on a metal chassis, no tools or screws needed. Fits any standard 120*120mm fan sizes. Washable and reusable. Gentle hand wash only. Do not bend, do not wash in a washing machine. Clean every couple of weeks or when dust appear. Fan Filter - In addition to being mounted on the casing, it can also be installed on the power supply. It can effectively reject the entry of dust when inhaling cold air, and effectively reduce noise. Provide efficient dust reduction properties and protect you computer from overheating. prevent the cable being cut by the fan, protect finger safety. Different quantity variations available like 6pc and 10pc