Safe Material:Small equipment for fun exercise, 106% food-grade silicone.Enhance Your Jawline:Chisel your jaw and achieve a stronger looking face.Improve Face And Neck Line:Define Your Jawline, Slim and Tone Your Face, Look Younger and Healthier .Mini and Portable:You can take them with you anywhere.Use them while, working out at the gym, jogging,walking your dog,driving,riding your bike.