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 dust-free. Suitable for use on computers. Extend the life of the fan. Can be cleaned and used multiple times. Applications: various standard sheet metal cabinets, enclosures, industrial control cabinets, electrical control cabinets, electrical control cabinets, distribution boxes, distribution cabinets, power supplies, full coverage cabinets, etc. Dustproof sponge only, other accessory demos in the picture are not included! Specifications: Material: Activated carbon foam Size: approx. 500x500x3mm/19.7x19.7x0.12inch 500x600x3mm/19.7x23.6x0.12inch 400x500x5mm/ 15.75x19.7x0.2inch 500x500x5mm/19.7x19.7x0.2inch 500x600x5mm/19.7x23.6x0.2inch Quantity: 1 piece 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 manual measurement Package includes: 1 pc dust cover