Description:Made of Food grade silicone material, non-toxin and healthy, to ensure your oral hygieneWide applications: suitable for most people, widely used for tongue muscles, lip muscles, teether and facial muscle trainingCan improve your chin line, shape and tighten your face and neck, and your facial jaw will look younger and more beautifulSay goodbye to double chins and loose facial muscles. Jaw exercise ball promotes face tone firming & chin lift, chisel jawline shaping, and v line slim by eliminating fat deposits around jaws and neckExercise the range and flexibility of jaw movement, and increase the strength of biting and chewingConvenient, Hands Free Workout, Keep With You, to Use On the Go, At the Gym, At Work, WhereverPlease boil the ball to soften the bite strips then briefly bite down at first and takes no more than 10-15 minutes every day in the first weekSpecification:Material: SiliconeColor: Yellow White Red Total Length: 21cm/8.3 inch Jaw exerciser size: 3.2x 1.9 x1.5cm/1.3 x 0.7 x 0.6 inch PVC box: Diameter 48mm/1.9 inch, Height: 42mm/1.7 inchPackage Includes:1x Jaw exerciserNote:1.Please allow 1~3 cm error due to manual measurement, thanks.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you