Wrapper card can be used on nondrop items like Hover, Weapon and Armors. When the these items are wrapped trading/vend of a nondroppable item is now possible. But wrapped items cannot be equipped unless you unwrap it.
Nondrop Removal Card is simply used to remove the nondrop of your Weapon and Armor processed by Premium Service. It simply means you will completely revert your item to droppable state.