Stainless steel mug materials are generally 201,202 and 304 stainless steel, the two most common are 304 and 201 stainless steel. Although the material is different, but both the material production and processing of stainless steel mug looks the same, ordinary people basically can not identify, even in the stainless steel industry may not be able to 100% 304 and 201 stainless steel.