Kaytee Woodland Get-A-Way Hideout is made from quality natural pine timber and wooden peg construction - no nails or staples. It provides pets with a natural sense of security, promotes nesting and satisfies chewing instincts. Fully assembled. Ideal for hamsters, gerbils and other small animals. Medium size measures 6-3/4"L x 5-1/2"W x 4"H with a 2-3/8" x 2-1/2" opening.