office mug ,vacuum bachelor cup, this style have lots of color, and the bottom have two style , please see as follows

office mug,stainless steel vacuum bachelor cup

about the bottom,

1, we use anury vaccum,

2.vaccumize and put a out steel back with  it.

it's very specialized field,

so i don't know how to description these technics.

if you interested in our products,

please contact me,

office mug,travel mug 2012 NEW