The carpet is supplied in a protective pouch. It is magnetized, which prevents the screws are walking on the carpet. The magnetic force of the carpet is not great, so do not attempt to return the carpet to see if the screws are going to stay on it, it probably will not! Nevertheless, it is sufficient for the screws do not fly in all directions if you move the carpet on a table. Attention some computer components are sensitive to magnetism (RAM, hard drives ...)!
The surface is a "whiteboard" and easily erases with a cloth. The included pen is a little cheap but works. There is a small brush clumsily stuck on the pen cap, but it erases bad, consider using a cloth. Overall, I am satisfied with this belt that greatly simplifies IT DIY tasks.
