Made of iron with shinobi whistle. Baked and finished in a blacksmiths furnace. It is very difficult to finish the iron with a shinobi whistle, and perhaps the only product in Japan. Total Length: Approx. 16.5 inches (42 cm); Weight: Approx. 21.3 oz (600 g); Made to a thick finish, yet small enough to be heavy. Based on the 7-hole shinowhistle, the musical scale is a dremi sound. It has 7 tones. The tone is heavier than bamboo shinobi whistle. The sound quality is also close to the shinoshi whistle. It has a performance that does not have any problems for those who can play a Japanese instrument horizontal whistle. Dimensions are almost identical to the common does. It feels good when inserted into it. It is very compatible with ten surgeries, iron fans, and shorts, and it can be used to attach rings to the holes of the tassels and so on. Please check the sound quality of the actual whistle in the YOUTUBE below. https://www.youtube.com/watch? v=BHUYiQs3DaY with anti-rust treatment inside However, it is an iron product, so there is no chance of rust. It is recommended that you clean it regularly. Care Instructions: Rub with vegetable oil such as camellia oil. Due to the forgotten smoking, the surface of the product may be smoked on your hands or clothes. Thank you for your understanding.