Enchanting Vellum

Enchanting Vellum is a type of paper enchanters can use to store enchantments for later use. This allows for the trade and sale of enchantments without the enchanter and client meeting face-to-face.

Source
This item is sold by enchanting vendors for or created with Inscription (35).

Previous types of vellums
Prior to patch 4.0.1, different types of vellum were needed depending on the level of the item to enchant or the type of enchantment; now, all enchantments can be applied to a single all-purpose Enchanting Vellum. Old vellums were converted to, which turns into Enchanting Vellum when used.