The classification of the double wall glass 2
effect.
glass with tail at the bottom there is a small drop point sample;Koala is flat glass, there
is no point.
Close to distinguish from the glass, the standard, the high mouth glass (mesh deeper, more
reasonable design, water won't touch screen).
To distinguish from the bottom of the cup, the ordinary thin bottom, thick round bottom,
thick bottom, the bottom of the crystal.