This thin sheet of bronze, the size of a roll of parchment, is embossed with Ioun's symbol in one corner.
Wondrous Item 360 gp
This material can be written on like paper or parchment, and the writing can’t be erased until the parchment’s owner wills it blank. It’s flexible enough to roll. Creating a ritual scroll using this item fills it with text, but takes half the usual time. Once the ritual is performed, the piece of Ioun’s parchment turns blank and can be reused.
Published in Adventurer's Vault 2, page(s) 76.