JINXIU Perfect Chin Shape: Say goodbye to double chins and relaxed facial muscles. The facial trainer improves jawline, quickly shapes and tones the face and neck, lifts the chin and creates the perfect jawline. SAFE AND PREMIUM MATERIAL: This line exercise is made of food grade silicone, BPA free, non-toxic, elastic and not easy to deform. You can exercise with confidence. 2 Block Chin Exercises: Product size: 3*1.7*2cm Resistance is about 45 lbs. This ball fits everyone and is perfect for your back molars for best results. Easy to use: Bite your molars hard for 10 seconds, feel the muscle force, then relax. Repeat 3-5 times per minute (please don't chew quickly), you can exercise every day according to your situation. EASY TO CARRY: The trainer can be taken anywhere and used on the go, in the gym, at work and anywhere. Quantity shipped: 2 pieces Product color: black