AK Gave 2 sources for obtaining this material...the first was the material that is used for computer covers...I have an old one here I need to relocate and work on...
He said to use a clothing iron and lightly iron one side of the material so it would be a bit stiffer in use...
The other place he mentioned was from a shop owner who got blanks or rods shipped into his shop wrapped in this same material

also the shop owner had packed and shipped it rather haphazardly and it had gotten wrinkled pretty bad and ironing it fixed that probelem as well......hope this helps out...