The Mouse Cubby for Thoren is designed specifically for the Thoren Maxi-Miser #9 mouse cage. It fits snugly against the ceiling, floor, and wall to create three separate cubbies that open to a common area. Made of durable corrugated fiberboard, the Mouse Cubby is built as a disposable product that can be chewed into nesting material. This allows mice to creatively adapt and modify their environment, keeping engaged and minimizing aggressive behavior. The dividers are sold in quantities of 300 per case. They are shipped Irradiated.