This is the Great Planes 4" Wide Heavy Weave Fiberglass.

Features

Great for adding strength to surfaces
90° cross weaves with white coloring
Consistent weaves for smoother finishes

Includes

One Heavy weight strip (4 inch(102mm) by 5 feet(1528mm))
One Instructions (part of the package header card )

Requires

Sand and clean surface, Epoxy Glue (GPMR6045) for porous
materials like wood or CA glue (GPMR6008) for plastics,
cut to size and filler HCAR3400.

Comments

Common usages: Cowl & Wing Center Wing Center Wing Center
Wheel pant Up to .40 Up to .60 Up to .90
GPMR1052 Heavy (1") *
GPMR1054 Medium (2") *
GPMR1056 Heavy (3") *
GPMR1058 Heavy (4") *