The collection contains 50 manuscripts, 21 of which are miscellanies. The total number of texts is 174.

The Karaite manuscripts of Levinus Warner in this collection have introduced Karaite texts to European scholarship and includes important Byzantine manuscripts containing works by Byzantine Karaites and also Karaite Hebrew translations of eleventh-century authors who wrote in Arabic such as Yūsuf al-Basīr and Yeshuʾah ben Yehudah.