Because of its excellent inner liner material so that it has a good insulation effect. It use stainless steel straws, which is environmentally friendly and no peculiar smell. Smooth cup body makes the insulated mug comfortable to touch and easy to carry with. This insulated cup can keep the temperature with a strong heat preservation effect. The product is made of stainless steel and silicone. The width of the product is 8.2cm and the height is 10.5cm. It is suitable for home, car, school, dorm, etc. Item Name: coffee cup Material: stainless steel, silicone Net Content : 350ml Features: Heat Retaining, Portable, Practical Size Details: Size: 8.2cm x 10.5cm/3.23" x 4.13" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Cup 1 x Lid 1 x Straw