Mofusand in Shark Costume Wood Cap Tumbler-Japan ImportsMofusand in Shark Costume Wood Cap Tumbler Japan Imports This stainless steel tumbler with a natural wood lid can be used at home or in the office. The stainless steel tumbler has a double layer vacuum construction so that even if you put something cold in it, it won't stain your desk without water droplets. The double layer vacuum construction prevents water droplets from sticking to the surface and staining the desk even when cold drinks are served.