I was a bit skeptical at first of glass straws, but I have come to like them now. They are a unique product by its self because of the simple fact that these are not plastic, they are glass! They are pretty thick, but this is for durability purposes. They are essentially the same glass as most glassware objects that you use to put in ovens, so although glass they are pretty strong. This product is supposedly safe for kids, but I mean really now... I wouldn't advise giving these to kids for the simple reason that they can be broken if not taken care of properly. The cleaning brush is the right size to keep them maintained and they work like a charm and look very nice. If taken care of properly these should last a very long time and if not they do have a lifetime guarantee against breakage, even if accidental; however, the buyer is responsible for all shipping charges. Overall these are some really nice quality and good looking glass straws to own which I give a perfect 5 stars out of 5 stars!