The black design comes off as you wash this product, makes a huge mess each time. I would never buy this product again. I think you sell cheap stuff. I was going to return the glasses and do not expect a refund. I don't care about the money, the product should not be sold.
The black design on the glasses came off on your hands as you drank from the glass. This was after they had been hand washed. They are really cool looking, but they were a disaster. When I returned them to the store, the cashiers were also shocked as their fingers were black when they touched them.