Stainless Steel Beer Mug Double Wall Coffee Mug 350ml This mug is made of stainless steel that it is polished finish in the surface. Featuring double walled stainless steel, the mug keeps your drink cold or warm and the insulation makes you hold the mug with ease Its stainless steel construction means the mug is durable enough to stay longer. The mug is mirror finished, which is perfect for any modern decor. The lining of the mug is brushed finish for better use, in case your lips get hurt.