Get yours here: http://amzn.to/1M9mpkC
These glasses are perfect for everyday use in the house. I have dropped mine and all they do is bounce up off the floor. The clarity and special design mimics that of crystal glass.
Yes they do have a seam, however you will need to be looking for it in direct sunlight to notice it. I like to use these to cut up fruit in advance and put these in the fridge for snacks.
I received these discounted or free in exchange for my honest review of these. I will be purchasing more of these in the future. They make wonderful gifts to give too!