This Zojirushi S92-6B Stainless Steel Mug comes with a stopper seal specifically designed for SM-WA, SM-WG, and SM-WP models. Constructed from stainless steel, this mug is perfect for both hot and cold beverages. Its sleek design and adjustable stopper make it easy to use and store. Enjoy your favorite drinks with this mug that is sure to keep them hot or cold for hours.