Yamaha 2 1 1 standard flute cannot be equipped with a u-shaped flute head, but 2 10DR can be equipped with a u-shaped flute head (for children), but 21/sl can also be used, but 2 1 1 standard. If the +0SL is made of white copper, the price of 2 10DR is about 2980 yuan (few people buy it) and the price of 2 1 1 is about 3200 yuan (implemented in July 2009). If there are many functions, you can add 2 10DR. However, 2 10DR is not very popular in China, because few people in China buy U-shaped flutes. It seems that it will cost more to add a U-shaped flute head. At the same time, 2 10DR adopts white copper tube, which sounds lower than nickel silver. Actually, it's about the same. In addition, the output of 2 10DR in Xiaoshan, China is low, and no dealer is willing to purchase it, so it is less on the market, but to be honest, there is not much difference between 2 10 and 21. Both flutes are not bad, but the output of 2 10DR is relatively low, and the output of 2 1 1 is relatively high.