I have a couple of vinyl signs that I velcro to the KB...and they are great for promotion and for hiding wires, etc. I imagine they are much like the ones Russ is talking about..BUT...the manufacturer told me to roll them up with the print side OUT. If you roll it the other way, the vinyl letters are not stretched and will, in time, start to wrinkle (like me).

When not in use they are in a sturdy mailing tube and I try to keep them from sitting in a hot car too long.

Eddie