Thin parchment flyleaves from the re-binding of a manuscript written in the twelfth century, probably in England, containing Rufinus, Historia Monachorum, and texts by St Jerome, St Athanasius and others. The flyleaves contain fifteenth-century music on some but apparently not all faces, in void mensural notation that appears to have been washed out, deliberately or by exposure to damp, and has become hard or impossible to read.
The flyleaves comprise two sets each of two nested bifolia (at the front fos. i–iv, at rear fos. v–viii). Ff. vi verso–vii recto seem to be linked by a custos so may have been the centre of a gathering.
Staves have been drawn freehand as needed, though the outer pages (i-iv, v-viii) seem not to have been ruled. Most of the visible notation seems to be from cantus parts in void mensural notation, even on rectos, with C1 or C5 clefs where visible. It all appears to be in the hand of the same fluent scribe. There are some changes of mensuration, suggesting local proportional passages. The melodic style strongly suggests that of English composers in general around 1430, and Dunstaple, in particular .No verbal text can be detected on any of the pages.