Exercise Set: Suit for lateralization. Trainer: Suitable for the posterior alveolar position of to perform lateral alternate training. Trainer: Suitable for the front teeth position and down or left and right alternating training. Trainer: Suitable for alternately training the mouth and tongue. Application: Suitable for orthodontics, swallowing health awareness and other people need to carry out tongue training.Ideal for all ages,a ppropriate for both children and adults. Specification: Material: PP Metal Size Chart: Trainer:146mmx11mm Trainer:126mmx31mm Trainer:146mmx20mm Package Includes: 3 Pieces Exercise Set Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!