Niteangel Wooden Tunnel and Tube, Peep Hole Design for Hamster and Other Small Animals Add a nice natural feel to hamster cage. Satisfy the natural instincts to burrow, explore and nest. With several holes, this popular tunnel will give your hamster more ways to have fun, provide hours of exercise and self-amusement. A great furniture decor to your small animal house. 7-3/4-inch Length, 2-3/4-inch Diameter.