Features: Upgrade your facial contouring routine with our 4 pack 19th gen silicone jaw exercisers, featuring enhanced elasticity and durability to maintain perfect shape through rigorous training. Crafted from food grade silicone, these jaw trainers offer a secure grip and skin friendly texture for comfortable, not irritating daily muscle activation. Ideal for fitness enthusiasts and beauty conscious users seeking defined jawlines, particularly those with sensitive skin requiring gentle yet effective skincare tools. Compact enough for discreet office workouts, travel friendly for on the go toning, and versatile for home relaxation routines sculpts facial curves easily. Simultaneously engages cheek, jaw, and neck muscles, addressing uneven training results while promoting balanced cheekbone line over time. Specifications: Component： Silicone, food-grade Process: Precise molding, smooth and soft Parameters: 19th generation upgraded version design, optimized bitting strength, fit the facial muscle structure. Size:about 2.8x2.1x1.5cm/1.1x0.82x0.59in suitable for most adult size, easy to carry and use. Color: Optional Practicality: for facial care, it helps to improve facial lines and improve the contouring of the jaw by exercising the masseter muscles, Package Includes: 4PCS Silicone 19th generation masseter muscle training devices note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution