Lyson 3 frame polystyrene nuc (deep) with one-piece molded body, reinforced edges, two vent plugs in bottom, and one piece roof. No inner cover required. Has built-in entrance reducer and mouseguard closure.Measures:
21in. L x 7 3/8in. W 12 3/4in. H with an approximately 1 1/4 in. x 1 1/4 in. extension at the entrance.