... cup,frosty mug this product is made of PS have double walls an make beer cold . Plastic cup,water cup,frosty ... beer cold ,you can have cold beer in minutes.frosty mug ,have double walls, It is made from Acrylic(sterile ... small, not bulge lead to vessel broken, so that the mug is safe & non-toxic, First, keep the cup in ... the need of the human body's heat cycle exchanges. Plastic cup,ice mug,frosy mug