[Appropriate Size] The hot tent stove jack measures 9.1 x 7.9 inches with a pre-cut round hole of 3.7 inches, suitable for chimney tunnels less than 3.7'' in diameter. Please ensure to check the size of your hot tent stove pipe before making a purchase. [Fire Resistant Silicone Fiberglass] Crafted from high-quality fiberglass, this hot tent stove jack is highly flame-retardant with excellent temperature resistance up to 572/300, protecting your tent from burns caused by the stove pipe. It is recommended for use with wood-burning tents. [Removable and Replaceable] Featuring self-adhesive fasteners, the hot tent stove jack is easy to remove without damaging your tent. You can easily detach and replace it with a new one if the stove jack becomes damaged. [Easy to Use] Equipped with a strong self-adhesive nylon fastener, the hot tent stove jack can be directly attached to your tent's window, which is also designed with a self-adhesive nylon fastener. If your tent lacks an adhesive fastener, you can sew the stove jack on. It installs quickly in minutes. [Durability] This hot tent chimney jack is constructed from premium fiberglass with a delicate stitching process, making it tear-resistant, robust, and durable for long-term use. size: With a 3.7 inch (about 9.4 cm) round hole, 9 inch x 7.8 inch / 23 cm x 20 cm Material: fiberglass colour: white + black Package Contents: 1 x Hot Tent Stove Jack Only the package contents mentioned above, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product. The measurement allowed error is +/- 1-3 cm.