The frosty mug have double walls, it is made from Acrylic(sterile &innocuous material) . There is some special-purpose coolant between it is two walls, after frozen, the coolant came into the soft ice cream shape, and the expansion coefficient is sma... - Update: 2009-12-21

The frosty mug have double walls, It is made from Acrylic(sterile &innocuous material), There is some Special-purpose coolant between It?s two walls, after frozen, The coolant came into the soft ice cream shape, and the expansion coefficient is smal... - Update: 2009-12-21