Come and see our amazing products. The 8.5 ounce skull water glass beer mug is made of high temperature resistant high borosilicate glass. It is resistant to low temperature and high temperature from -20 degrees to 150 degrees, non-toxic, very safe and healthy. It is two layers of transparent glass, the inner layer is in the shape of a skull, which is very individual. Welcome to use a custom logo. Pls confirm with us about the packing info, stock color and exact production time before placing your order.