Phylactery A case is constructed of two pieces of stitched leather. It contains four chambers and each compartment can hold a minute slip containing a prayer. Meant to be worn on the arm, phylactery case B has only one compartment. It is formed of a single piece of leather folded in two, with one half deeply stamped out to contain a tiny inscribed slip. A fine leather thong was inserted at the middle, and the halves were folded over and stitched together.
LAYOUT OF PHYLACTERY CASES IN COMPUTER IMAGE C D B A E
Discoveries in the Judaean Desert, I, p.7. Oxford, 1955.