Feature: 1. Function: Increases the flexibility of the tongue and changes the clarity of speech. It can be used to exercise the muscles of the cheek, soft palate and pharynx. 2. 4pcs Set: Each tool is divided into two parts of handle and exerciser. It can promote the correct construction of oral motion patterns required for articulation and provide tactile and proprioceptive feedback to sensorimotor stimuli. 3. Applications: Suitable for oral movement disorders, articulation disorders (motor, organic, functional) language disorders, resonance disorders, swallowing problems, etc. 4. Suitable People: Suitable for people above 8 years old, promote lip closure movement, tongue flexibility, tongue strength, change speech clarity. 5. Material: Made of food grade plastic material, before and after use, use special cleaning liquid to soak and warm water to clean, do not use boiling water. Specification: Item Type: Tongue Muscle Trainer Material: Food Grade Plastic Length: Approx. 16cm / 6.3in Functions: Promote lip closure movement, tongue flexibility, tongue strength, change speech clarity Suitable Age: Above 8 years old . Package List: 4 x Tongue Muscle Trainer Note: 1. Dedicated to one person use, do not mix use to prevent cross infection.2. Can not be placed in the microwave for clean. 3. Before and after use, use special cleaning liquid to soak and warm water to clean, do not use boiling water.