This is a 12' Strip of Carbon Fibre Tape from Dave Brown Products.
Used to strengthen radio controlled planes, model rockets, sail-
Any balsa, foam or wooden structure may be laminated to increase
their strength up to 300%.
Typically applied to opposite sides of wing spars, ribs, fuselages,
and other structured members.
Bonds well with epoxy resin or CA glue.
One 12' Carbon Fibre Strip.
Instructions on back of package.