Color: blue, green feature: 1. It is suitable for voice, harder tongue, incomplete pronunciation, which can be used to exercise the flexibility of the tongue. 2. Help solve the problem of unclear pronunciation and unclear elderly people. 3. Train tongue muscle strength, tongue elasticity and stability. Improve the tongue muscle strength and tongue coordination. 4. Enable the coach to independently grasp the flexibility and stability of the tongue. 5. There are two ways to exercise training, and exercise training on the left and right alternation, you can choose according to your choice how to use: You can choose according to your situation1. Up and down exercise trainingOpen your mouth, put the tongue movement vertically in the middle of the mouth, and then push the ball upward from the bottomThe tip of the tongue recovers from top to bottom. Repeated training 50-100 times;2. Left and right exercise trainingOpen your mouth, put the tongue movement level in the middle of the mouth, then push the ball orRepeat 50-100 exercises from the right side to the side with the tip of the tongue. Comment:1. Manual measurement tolerance is 2-5g. Please don't mind your replacement.2. Due to the differences between different display, the image may not reflect the actual color of the item. thank you very much 3. SKU color is the color of the product packaging Package Included:1 * Tongue training device