[ Natural Sisal ]: The curved surface is wrapped by high-density natural sisal, durable and resistant to scratching! After a short rest, cats can also get up to do exercises, sharpen their little paws, kill the boring time, and you can save money for the cat scratching board!.[ Curved Surface & Suspension Design ]: There is no shelter design above the cat wall shelves so that cats can jump ly; the curved concave surface design makes the cat more comfortable and r while lying! Let your cat enjoy a cozy time in the sun!.[ Safe & Firm ]: The entire cat window bed is a pine wood frame, supported by upper and lower iron brackets and 4 high-strength PVC suction cups. The 4 suction cups can be firmly adsorbed on a smooth surface and can withstand a weight of up to 30 lbs. When the 4 suction cups are kept parallel up and down, the endurance at this time is the largest and it is not easy to fall off!.[ ]: Just install 4 suction cups on the two ends of the upper and lower brackets, and then fix the lower bracket to the upper bracket, which can be installed on various smooth material surfaces such as glass, ceramic tiles, stainless steel, mirrors, etc..[ Please Note ]: Before installation, it is recommended to soak the suction cup in warm water (at least 60℃) for 5 minutes to increase the suction power of the suction cup. Especially in winter, the suction cup is easy to harden and reduces the suction power!