Food-Grade Stainless Steel Mug: Our coffee mug is made of high-quality stainless steel. Electropolished on the inside, it is rust-resistant, non-toxic, and tasteless. It's healthier and more durable than traditional plastic cups. Double-walled vacuum insulated mug. The insulated mug features double-layer insulation technology and a rubber-coated exterior. Not only is it easy to hold in your hand, it also fits in most cup holders. The vacuum insulation technology keeps drinks hot for 6 hours or more and cold for 6 hours or more. Perfect for car cup holders: This thoughtfully designed travel mug fits most car cup holders. This large-capacity coffee mug is perfect for your trips and worldwide excursions. Feel free to hold the mug comfortably in your hand; it won't interfere with your driving. The perfect companion for your journey. Capacity: 600ml. Keeps cold or warm. Interchangeable base.