Card Sleeve Double Sided Fire Box Outdoor Feature:1. [durable material] Made of flame retardant cotton layer, fire-resistant aluminum foil and fiberglass silicone coated fabric, high temperature resistance range is - 50 - 550 °C.2. [Reflected Heat] Use a premium layer of aluminum foil that reflects 96% of radiant heat and is cool to the touch to protect your lawns from burning to death.3. [Double-sided] both front and back are made of fire-retardant aluminum, which can protect marble, concrete, stone, wood, grass, iron floors from burns, damage, deformation on both sides.4. [Washable & Reusable] The card sleeve is heat-insulating, fireproof, easy to clean from various oil stains or other accessories attached to its surface, and can be used repeatedly.5. [Wide Application] The versatile round design can be placed under a larger fire box, charcoal grill, or fireplace, making it suitable for most homes. Specification:Item Type: Fire Pit Box MatMaterial: Fireproof Cotton Layer, Fireproof Aluminum Foils and Silicone Coated Fiberglass Thickness: 0.4mm-6mmHigh Temperature Resistance Range: -50-550°C Color Packing:1 x Fire Pit Box MatNote:Make sure there must be at least 4 inches of space between the heat source and the pad for proper thermal protection.