Perfect Jaw Line- Our jaw exercise ball directly targets the jaw muscles and burns fat deposits in this area for a slimmer face. Unlike other jaw training models, ours prevents any damage to your teeth, gums, and joints. 3 Resistance Levels- The jawline exercise chew trainer set contains 8 pieces, divided into 3 resistance levels (blue 40 lbs, red 50 lbs, black 60 lbs), allowing you to gradually increase the strength as your jaw muscles grow to get a better Workout effect. High-Quality Material- Our jawline exercise device is made of high-quality food-grade silicone, which is durable and comfortable to use. The soft and stretchy material ensures a perfect fit without any discomfort.