Each cuckoo clock is hand crafted. The clock is made of wooden birch plywood. Painted parts are painted and varnished with water-based painting and varnish. Unpainted parts are not varnished. Clock hands are made of recyclable plastic. Cuckoo bird comes out, chirps, flap wings and make the cuckoo sound every hour than goes back inside (The bird is out in the pictures). Cuckoo count changes regarding time. (For example when it is 11 AM the cuckoo sound counts 11 times) The clock is silent...