The pueikai Cat Hammock is perfect for keeping your large cat comfortable and safe. Made of high-fiber glass robs and steel wire rope, it is durable and sturdy. The hammock features two strong knob suction cups and two thickened push-type suction cups. With the newest screw suction cups of a lower fall-off rate, the cat hammock can better adhere to the window. By tightening the screw cap, the air will be more cleanly squeezed out. Strong suction cups ensure that the hammock will be more safe and longlasting to use!