Fun Hammocks for small pets to hide in sleep in . You will love to watch your pet hide, peek and run in and out of these soft hammocks. The Hammocks are 19 inches X 13 inches long. Made out of Polar Fleece and either Cotton or Flannel fabric. There are three openings for your pet Rat or Mouse to go through. They can sleep in side or on top. *** The inside Fleece color may vary.