Feature: 1. Tongue Muscle Training: The training is mainly carried out through the feedback between the tongue and the trainer, which can quickly improve the flexibility and muscle strength of the tongue, thereby changing the clarity of speech. 2. Oral Movement Construction: Tongue trainer facilitates correct construction of oral movement patterns required for pronunciation and provides tactile and proprioceptive feedback for sensorimotor stimulation. 3. Multi Purpose: Oral muscle exerciser can be used to exercise the muscles of the cheeks, soft palate and pharynx, and to train the lip closing movement. 4. Wide Range Of Applications: Oral muscle trainer set is mainly suitable for people with oral movement disorders, articulation disorders (motor, organic, functional), language disorders, resonance disorders, etc. 5. Plastic Material: Tongue muscle recovery tool is made of food grade plastic material, safe and eco friendly, firm and durable. Ergonomic design, easy to hold and use. Specification: Item Type: Tongue Muscle Trainer Material: Food Grade Plastic Length: Approx. 15.8cm / 6.2in Function: Promote lip closure movement, tongue flexibility, tongue muscle strength, change speech articulation Applicable Age: 1-7 years old. Package List: 4 x Tongue Training Tool Note: 1. Individual use alone to prevent cross infection.2. Can not be placed in the microwave oven to clean.3. Soak and clean with special cleaning solution before and after use, do not clean with boiling water, clean with warm water.4. Please allow slight error due to manual measurement. Thanks for your understanding.