The cords or thongs on which the sections of a
book are sewn. The cords, of which there are
traditionally five (but which historically have
varied from two to as many as fourteen) are seen
as ridges across the spine of the covered book.
Raised bands have long been associated with the
best of fine hand binding and the TIGHT BACK . False
raised bands. which are generally glued to the
hollow of the spine, are sometimes used to give
the impression of FLEXIBLE SEWING .
Such books are generally sewn on sawn-in cords.