Hollow whistle or cuckoo sound - The hard wood body is similar to the hollows built for birds. Height: 10-12 cm, Ø 5 cm. We blow into the whistle which is on the top of the hollow and by closing and opening the holes drilled on the body, we can change the height of sound. It reminds us of the sound of cuckoo. The surface is treated with linen oil. It is 100% hungarian handicraft product.