-- non-subscriber, please reply to sender and MMD --

I use Velcro plant ties for piano rolls. They come in rolls about
1/2 inch wide by 30 feet long.  Just cut of what you need.  They
keep the piano rolls secure and don't damage them.

They're hard to find at garden centers (they are always out), but
I did find an abundant supply at the John Deere gift web site:
http://www.johndeeregifts.com/product-product_id/289923

 [ At http://www.velcro.com/CONSUMER/products_lg.htm
 [ Velcro 90594 plant tie roll: 30 feet x 0.5 inch.
 [ -- Robbie