A poly resin black simulated rock with a plastic false bottom. These work really well with the included water-tight bison tube for that extra level of protection.
Sizes vary slightly but are approximately 3 1/2" x 2 1/4" x 1 1/2" with the log opening 2 3/8" x 1 1/4" x 1".
A Rite in the Rain® log sheet is included.