This set of four 13.5 oz beauties is crafted from lead-free borosilicate glass, keeping your tea luxuriously hot (or iced coffee refreshingly cold) for extended enjoyment. The double-wall design ensures no more burnt fingers or messy condensation rings, just pure sipping serenity. But the magic goes beyond function! The rippled design adds a touch of vintage flair to your tea time, creating a calming visual element that complements your moment of peace.