Stainless Steel Mug The Stainless Steel Mug is a mug with a double wall to hold your drink at a good temperature. The mug has a capacity of 350ml. There's a handy handle on the mug so you can easily pick up the mug. The inside of the mug is polypropylene, the exterior is stainless steel. The mug is in seventh Be several colors. You can have your own design or logo designed pressing the mug. You can print your design or logo in up to five colors. You can also engrave your logo. The Stainless Steel Mug is produced BPA Free.