The back plate for this door knocker is made of Russian birch plywood, the skull is made of urethane foam, and the ring is cast from solid resin. The ring is detachable, holes are not pre-drilled for screws. I do recommend that you use E-6000 and screws to mount this knocker
Measurements are approximately 11.75" long, 7.75" wide, and the skull protrudes out about 3"
*Dollar not included*