Galvanized wire construction. The edges have been preformed smooth to give rigidity to the box and protect the doe and litter from injury entering and exiting the nest. Includes sanitary liner which can be disposed of when young leave the nest. Allows for use of Nest Box Warmer below the liner. We also include metal phalanges to cover wire sides and clips. Shipped un-assembled. You will need clincher type tool for construction (see CLCL below). 18" L x 10" w x 8" deep.