Safe and Secure This main frame of this cat bed is made of thickened wood and hard metal. Ideal for large cat. Maximum weight capacity 60 lbs. Tool-Free Adjustment The assembly of this cat window hammock is easy that only a few steps are taken to set it up. Just adjust the thumb screw to adapt to different window sills. No Suction Cups Dropping Risk This cat bed is fixed by the metal hook hanging on the place, without the need to damage the wall and the worry of the suction cups falling off.