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Gently hold the bottom with your ring finger in case your ring finger falls off when all other fingers are loosen.
Gently press the air hole with your finger pulp instead of your fingertips. Do not leave a gap or press too hard.
Please put the mouthpiece into your mouth and do not squeeze too deep.
Note: Due to manual measurement, there may be 1 piece. -1.2 inches (3 cm), please understand.