Features: Active carbon foam material, dustproof and long-lasting. Large size, low resistance, temperature resistance (but not fire resistance). Keep your computer clean and dust-free. Suitable for use on computers. Extends fan life. Can be cleaned and reused multiple times. Applications: various standard sheet metal cabinets, enclosures, industrial 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/19.7x19.7x0.12in 500x600x3mm/19.7x23.6x0.12in 400x500x5mm/ 15.75x19.7x0.2in 500x500x5mm/19.7x19.7x0.2in 500x600x5mm/19.7x23.6x0.2in Quantity: 1 piece Note: Due to lighting effects and shooting angles, there will be some tolerances in the product, please understand. Please allow 0-1cm error due to manual measurement Package includes: 1 pc cover