Jaw exerciser: Define your jaw with this three-piece jaw exerciser. Easy to use: Simply place between the teeth and squeeze and release, this motion activates your facial muscles, increases blood blow and tones the face. Portable: The pack includes three carrying cases which makes it convenient for on-the-go workouts. Material: Made with food grade silicone that is durable and easy to clean. Features: This three-piece set includes a 30lbs, 40lbs and 50lbs resistance exercisers that requires just 5-10 minutes of chewing exercises for a defined jawline.