The glass water bottle is made of ultra clear borosilicate glass, it is a kind of special environmental and healthy glass material.304 stainless steel cap with O-ring for water tight seal, and it is important, the o-ring is made of food grade silicone, there is no smell , and safe to drink. And it is easy to carry everywhere you go, such as outside, ride, run, in office and at home. The glass is heat-resistant so that it is can take hot water, hot milk, hot juice etc, of course, it is a seal bottle, as it is tight seal and there is 18.59OZ. There are four color for you choose: black/blue/green/pink, which is match for your life color require