Number of Pieces: One Unit
1. The mouth of model A is upward, and the mouth of model B is downward.
2. The length and shape of the side are different. Type B should be longer. It should be flat to the ear after wearing.
3. The mouth cover is made of rubber, and the fixing belt is made of leather. The mouth ball is about 4.5 cm in diameter. It can be disassembled and fixed at any suitable position for wearing.