A superior quality of writing material produced from animal skins by a process of cleaning, stretching, and rubbing with chalk or pumice. Parchment is durable and holds ink well on both sides. From the second century BCE, parchment and leather were preferred for Torah scrolls intended for public reading. Parchment gradually replaced papyrus for most purposes during the first two centuries CE, and it remained the standard writing material in Europe until the advent of mechanical printing. Thus, the great majority of biblical manuscripts are written on parchment. The membrana mentioned in 2 Timothy 4.13 were parchment or leather documents of unknown content.
See also Books and Bookmaking in Antiquity.