Description: Made of Food grade silicone material, non-toxin and healthy, to ensure your oral hygiene Wide applications: suitable for most people, widely used for tongue muscles, lip muscles, teether and facial muscle training Can improve your chin line, shape and tighten your face and neck, and your facial jaw will look younger and more beautiful Say 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 neck Exercise the range and flexibility of jaw movement, and increase the strength of biting and chewing Convenient, Hands Free Workout, Keep With You, to Use On the Go, At the Gym, At Work, Wherever Please 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 week Specification: Material: Silicone Color: 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 Plastic box: Diameter 48mm/1.9 inch, Height: 42mm/1.7 inch Package Includes: 1x Jaw exerciser Note: 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