No Suction Cups or Drilling Needed Ensure your window has a SLOT at least 0.5 inches deep for the perch to hook onto (hook thickness: 0.08 inch). The bracket is widely adjustable to fit various setups, with a maximum window sill depth of 9 inches. The perch can be moved from window to window by simply lifting it up. Machine Washable Bed, Replacements Available The cushion can be removed for cleaning, take off the bed, cold wash and low tumble dry, then reinstall. Replacement beds are available for purchase. Search: B0D5MDR2N5 No risk of zip breakage A sewn-in sleeve-style bed-to-frame attachment delivers a secure hold for long term use.