Field Covers

[KTown49er]

I've seen a number of posts bragging about their new custom field covers (and they look incredible...BTW)...and they seem to be produced by a variety of people.

1- What are the field covers made of?
2- Are they magnetic?
3- Do they affect the speed/vibration/noise?
4- Are they removable?
5- How durable are they?
6- How much?
7- What are the differences between the one's Raiderman makes vs Wierdwolf/Kansas Bill vs what Decal Master is planning to unveil?

I think I would love to order a couple but I need some input!!!