Kaytee CritterTrail Fun-nel Look-OutThe Kaytee CritterTrail Fun nel Lookout is a convenient expansion for your small pets habitat that provides some extra play space and a 360 view of the outside world. The lid features a twist lock that keeps your pet safe and secure while allowing you easy access for cleaning. Provides small pets a 360 degree view Secure twist on lid allows easy access Universally connectable to CritterTrail habitats and accessories CritterTrail Fun nel Dimensions: 7.