The patent pending K&H Kitty Sill - EZ Window Mount is the easiest, strongest, most versatile window sleeper on the market. Weï½ve incorporated 2 push ï½nï½ turn suction cups and 2 giant push cups for the ultimate in strength. These things suck! Really! Each suction cup holds in excess of 100 lbs. yet is still easily removable for cleaning. Exclusive design allows for window blinds, curtains and shades to operate normally! Cover easily removes for washing. Features: Giant push 'n' turn suction cups provide incredible strength Allows use of window blinds, curtains, and shades when folded Removable, washable cover Large enough for big cats, measuring 12 x 23   Read less