Index card: Made from a bamboo cane which has been cut through above a bamboo intermediate base so that the lower end is closed while the other end is blown into. There the bamboo is cut diagonally towards the centre of the hole. About 2/3 of the cane is split. When blown into the tube, the split bamboo is compressed in such a way that the air can only escape through the very narrow gap. Used as a children's toy. Condition at the time of purchase: good, but the instrument can no longer be blown due to dryness.