This modern, chic and perfectly crafted glass cup（www.NTSmart.com）is a great way to serve tea. See the infusion, taste the tea at its best and you won't get your fingers burnt. Our double walled glasses are handmade (and mouth blown) from borosilicate glass which is both heat resistant and light weight. The unique double wall design insulates your tea, keeping it hot without burning your fingers. Our double wall glasses are hand blown by master craftsmen and women. Because this glass is mouth-blown, each one may have slight differences in height, thickness & weight. We invite you to visit our website at www.NTSmart.com anytime, you can find the prefer Double Wall Glass Cup. Also please feel free to contact me by email. My email is B2B@NTSmart.com,thank you very much for your consideration！