Food Grade SiliconeMade of food-grade silicone and polyurethane, safe and non-toxic, forming a bite strip, suitable for men and women of all age groups, will not cause any chemical damage. The sturdy bite strip is not easy to break, so you don't have to worry about neck tonging exercise ball breaking and hurting you. Ergonomically DesignWith safe and unique design, this jawline exerciser can tighten the muscles of your face and neck to achieve shaped, chiseled, and young smile. Keep using neck toning fitness ball to exercise, the wrinkles on your face will reduce, and your skin will restore tighten and elasticity. Getting a beautiful jaw is not a dream. Obvious EffectJaw exerciser and neck toning equipment tones and tightens underlying facial muscles to help reverse the signs of aging. exercises facial muscles to reduce sagging, wrinkles and smile lines, looks younger and better. reduce hunger, it has been shown to reduce cravelling, resulting in more weight loss. Convenient to CarryPortable and lightweight design makes this jaw exerciser ball more easy to be carried. Just put it in your pocket or bag, comes with hanging rope, you can hanging it on your neck, convenient to us in anywhere and any time, such as gyms, workplace, business trip. Simply wash it by hot water before and after each use to keep it clean and safe. Applicability OccasionCome with a lanyard, great for anyone interested in health and fitness, who wants to create a more muscular, youthful appearance. Its the hands-free workout that anyone can do. Convenient to keep with you wherever, such as work, gym, cooking, workout, even fishing.