Living World Bamboo Nest for finches provides a comfortable and secure shelter for nesting pairs and their young. Made of natural bamboo, the cozy nest encourages natural breeding. The nest comes complete with a metal hook for easy installation on the bird cage wiring. For indoor use only.Size: 8 cm (3.1") x 9 cm (3.5") x 12 cm (4.7"). Nest opening: 5 cm x 4 cm (2" x 1.6").