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, 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/19.7x19.7x0.12in 500x600x3mm/19.7x23.6x0.12in 400x500x5mm/ 15.75x19.7x0.2in 500x500x5mm/19.7x19.7x0.2in 500x600x5mm/19.7x23.6x0.2in Quantity: 1 pc 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