Review on 🔸 Stackable Shatterproof Reusable Tumblers - Best Spring Selection by Ines Jones

The glasses are made of very durable plastic. They are transparent. The bottom is well weighted for stability. They have been in the dishwasher at least 10 times and still look brand new. A good product!. My only minor complaint is that the squareness of the top edge is a bit dull. It's very slick, but I find myself trying to drink from one of the corners.