GuinnessRed Collection Pint Glasses,20oz, Set of 2

Are these dishwasher safe? Will the emblem wear away over time?

1. Does the glass really look like the 4th (last) photo when filled with beer? 2. what is the size? Is it ideal for 14oz cans ? 3. What is a seam ?

does this item have a visible seam?

Are these made of glass and not acrylic or some other similar material?