These white flute membrane mouthpieces are made of high quality plastic, which is durable and lightweight. They are suitable for various wind instruments such as kazoos, flutes, clarinets, saxophones, etc. The size of each mouthpiece is 18 mm, which is suitable for most people. The package includes 10 pieces of white flute membrane mouthpieces, enough for you to use and replace. These mouthpieces are easy to install and use, and they can effectively improve the sound quality of your wind instrument.