These tops are so perfect. Not only do the stainless steel straws that come in the drink top and straw kit feel so great when cold smoothies run through them, they are so practical, lightweight, and easy to clean! They even come with a really cute straw cleaning brush! Even better, this lid is made to fit standard canning jars and because of that they can fit onto any glass jar and turn it into an upcycled drinking vessel (think coconut oil, nut butter, salsa, jam... the possibilities are endless!) It is totally safe and made from stainless steel and is surrounded by a silicone gasket to keep your favorite drinks from leaking. I still want to try out glass straws, but have to get over my fear of breaking them!