Our store is committed to providing cross-border products, and popular items will not be returned or exchanged unless there is a quality issue All products are not intended for domestic sale and are only for cross-border sales. Please do not place orders for personal use Generation one, generation two: Product Name: Jaw Muscle Trainer Material: Silicone + Polyurethane Packing quantity: 200PCS Outer box dimensions: 36*26*20CM Product weight: 32 grams including color box, 26 grams net weight Color box size: 5*3*4.5CM Product dimensions: 4.3 * 3 * 3.6 cm Three generations: Product dimensions: 3X1.6X1.5CM Weight: 4g Material: Silicone