Features: Activated carbon foam material, dustproof and with a long service life. Large size, low resistance, temperature resistance but not fire resistance. Keep your computer clean and dustproof. Suitable for use on computers. Extend the service life of the fan. Can be cleaned and used repeatedly. Application areas: various standard sheet metal cabinets, cabinets, cabinets, industrial control cabinets, electrical control boxes, electrical control cabinets, distribution boxes, distribution cabinets, power cabinets, comprehensive cabinets, etc. Only dustproof sponge, other accessory demonstrations in the picture are not included! Specifications: Material：Activated Carbon Foam Size:approx 500x500x3mm/19.7x19.7x0.12inches 500x600x3mm/19.7x23.6x0.12inches 400x500x5mm/ 15.75x19.7x0.2inches 500x500x5mm/19.7x19.7x0.2inches 500x600x5mm/19.7x23.6x0.2inches Quantity: 1PC Package Includes: 1PC Foam Cover note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment