... glass can pass top Hot and top Cold test. B.Double wall cup keeps hot drinks hot for a ... ,yellow,pink,purple,opaque black,transparent black,opaque white.B.Size Dia:9mm,9.5mm and 12mm Length:6"- ... for some colors,it is Grade A and Grade B.B.Producing glass bong,glass straw and other crafts:Firstly: ... after-sales service.Our factory:Booth at Canton Fair: jade white candleholder manufacturer in china