Features: Make of food-grade silicone, nontoxic, ensures comfort and effectiveness during use. It can easily cleaned with water and soap. Suitable for fitness enthusiasts, swimmers, and those lookings to improve their jaw strength and face muscle. Simple put the training ball into the mouth, bite with the mouth and engage in chewing movement to perform face muscle exercises. Convenience and easy to carry, the Jaw Exerciser can used home / while traveling. Incorporate it into your daily routine for effective face muscle training. Improve face muscle and boosts your confidence. Start your journey towards a healthier & more tone face today. Specifications: Materials: Silicone Color: Black/Gray/White/Redness/Blue Size: As shown in the picture Note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color. Package includes: 1pc Jaw Exerciser