The Vindolanda tablets are made from birch, alder and oak that grew locally, in contrast to stylus tablets, another type of writing tablet used in Roman Britain, which were imported and made from non-native wood. The tablets are  thick with a typical size being  (the size of a modern postcard).
Vindolanda tablets are constructed from local birch, alder, and oak wood, unlike stylus tablets which were brought in from elsewhere and made of non-native wood. These Vindolanda tablets are typically quite thick and measure the same size as a modern postcard.