Great quality glasses!! I bought them for a pool party to make frozen drinks & milkshakes. Everyone thought they were real glass! They are heavy duty acrylic, crystal clear (no scratches) & no seams. They came double boxed (a box within a box), individually wrapped in plastic & they each had their own compartment... so they were nicely packaged. They held up perfectly through the party... which I would say was heavy use. Some were even dropped & never cracked or broke. I did hand wash them & didn't use the dishwasher (I'm not sure about that). I stored them away for future parties. I would definitely buy these again if I needed more.