... to drinking, double adiabatic, good demeanor, share view and admire!3.Quality certificate: environment-friendly borosilicate glass, virulent and inodorous,safe ... to drinking ,double abiabatic ,share view and admire5.Expansion coefficient : 3.3Product craft: handmade, advanced equipment ,Ancient craftBlend in modem science ... drinks before heated the product Transparent Double Wall Glass Cup with handle